Forum — Daily Challenge

    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    1. Home
    2. General Discussion
    3. Math Problems
    Log in to post
    • Newest to Oldest
    • Oldest to Newest
    • Most Posts
    • Most Votes
    • Most Views
    • S

      AMC 8 Question
      • superdog

      5
      0
      Votes
      5
      Posts
      105
      Views

      S

      The probability of Jack picking a yellow or white sock is 0.6 (60%).

      The probability of Jack picking a blue sock is 4/14 (28.6%)

      The probability of Jack picking a red sock is 3/14 (21.4%)

      The probability of Jack picking a white sock is 2/14 (14.3%)

      The probability of Jack picking a yellow sock is 1/14 (7.1%)

      Therefore, the probability of Jack picking a yellow or white sock is 0.6 (60%)

    • mathnerd_101

      FORUM REVIVE(hopefully)
      • mathnerd_101

      6
      0
      Votes
      6
      Posts
      159
      Views

      S

      Yes very fun and totally not pain and suffering. 🙂

    • S

      Doesn’t 11 have two 1s ?One on the tens digit and one on the units digit? Why does the answer says that 11only have 1s on the tens digit?
      • smilingtadpole 1

      2
      0
      Votes
      2
      Posts
      52
      Views

      mathnerd_101

      @smilingtadpole-1 In this problem, we do not care whether 11 has one or two 1s. What matters is the fact that 11 contains a 1. When you solved this problem, you assumed that because 11 had two ones, it should be counted twice, which is incorrect. I hope this helps!(also charge your device lol)

    • M

      1991 AMC 8 Question 16
      • magnificenthorse

      4
      1
      Votes
      4
      Posts
      161
      Views

      M

      Thanks for the explanation. I guess I didn’t think that the card had numbers on both sides. But it makes sense now.

    • R

      Type in as many math problems as you can find
      • reliabledove

      5
      0
      Votes
      5
      Posts
      107
      Views

      E

      -1x-2+3-4+(5x6-7^2)- -18=?

    • V

      In This Math Game, How Many Results Can You Get?
      • versatilemole

      3
      1
      Votes
      3
      Posts
      96
      Views

      lucky_ducky1

      @versatilemole i could give as many solutions as i can to this problem, and then people can add on solutions and count how many ways we can make 100.

    • R

      A trick about blahblah^0
      • reliabledove

      1
      0
      Votes
      1
      Posts
      73
      Views

      No one has replied

    • R

      How do you vote for somebody?
      • reliabledove

      1
      0
      Votes
      1
      Posts
      50
      Views

      No one has replied

    • M

      Mathcounts National Sprint Round Please Help
      • meticulousbunny

      2
      0
      Votes
      2
      Posts
      158
      Views

      mathnerd_101

      Not really 🙂 Notice how Elmo has three blocks. It wouldn't be $$\binom{9}{3}$$ because you use a separate block every time so you would have to choose the first block, then the second, and so on. Try to see where you can go from there 😉

      Note: Sorry this is so late I doubt you're active on this forum anymore.

    • R

      Sorry about my previous post, I made a mistake
      • reliabledove

      1
      0
      Votes
      1
      Posts
      60
      Views

      No one has replied

    • R

      My little sister said this is how you solve adittion
      • reliabledove

      1
      0
      Votes
      1
      Posts
      62
      Views

      No one has replied

    • T

      Expanding my question on LS#17 M3
      • TheConfusedOne

      3
      1
      Votes
      3
      Posts
      91
      Views

      T

      @knowledgeabledog Thanks!

    • B

      Some interesting fill in puzzle
      • boldsidewinder 0

      3
      2
      Votes
      3
      Posts
      88
      Views

      B

      @rationaltiger Correct!

    • A

      An Grade 4 Math Olympiad problem
      • altruisticgoat

      2
      0
      Votes
      2
      Posts
      119
      Views

      T

      =1+11+111 times 68
      =12+548
      =560

    • P

      Random(but interesting) problem
      • Perceptiveeagle

      1
      0
      Votes
      1
      Posts
      109
      Views

      No one has replied

    • M

      An interesting problem (3)
      • modestwallaby

      2
      0
      Votes
      2
      Posts
      142
      Views

      C

      24+3/4(24)(2)+(3/4^2)(24)(2)+(3/4^3)(24)(2)+.....
      (The x2 is because the ball drops the same distance up and down)

      This is an infinite arithmetic sequence.

      Let S = 3/4(24)(2)+(3/4^2)(24)(2)+... = 36+(3/4)(36)+(3/4^2)(36)+....
      So 4/3S=48+36+(3/4)(36)+....
      So 4/3S-S=1/3S=48
      So S=144
      So S+24=168?

    • M

      An interesting problem (2)
      • modestwallaby

      3
      0
      Votes
      3
      Posts
      140
      Views

      M

      MISSPELL has 8 letters with 2 S’s and two L’s. 8!/(4!2!) = 10,080 arrangements, but one of these is the correct spelling, so there are 10,079 misspellings in total.

    • M

      An interesting problem
      • modestwallaby

      1
      0
      Votes
      1
      Posts
      69
      Views

      No one has replied

    • M

      Mathcounts National
      • meticulousbunny

      1
      0
      Votes
      1
      Posts
      123
      Views

      No one has replied

    • M

      Mathcounts problems help
      • modestwallaby

      1
      0
      Votes
      1
      Posts
      154
      Views

      No one has replied

    • 1
    • 2
    • 3
    • 4
    • 1 / 4
    Daily Challenge | Terms | COPPA