User contributions
- 23:06, 14 February 2021 (diff | hist) . . (+12) . . 2013 UNCO Math Contest II Problems/Problem 2 (→Solution)
- 23:04, 14 February 2021 (diff | hist) . . (-4) . . 2013 UNCO Math Contest II Problems/Problem 2 (→Solution)
- 23:05, 24 January 2021 (diff | hist) . . (-324) . . How many times does the digit 9 appear in the list of all integers from 1 to 500? (The number $ 99 $, for example, is counted twice, because $9$ appears two times in it.)
- 20:02, 23 December 2020 (diff | hist) . . (+527) . . N Four fair coins are to be flipped. What is the probability that all four will be heads or all four will be tails? Express your answer as a common fraction. (Created page with "A standard deck of 52 cards has 13 ranks (Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King) and 4 suits (<math>\spadesuit</math>, <math>\heartsuit</math>, <math>\diamondsuit...")
