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Complicated algebra problem? A number subtracted by The same number but its digits scrambled is always a. Multiple of 9. Please give me a proof?

You are dealt 5 cards from a standard and shuffled deck of playing cards. (52 cards) what is the probability that youâ€™ll have at most three kings in your hand?

Six sided die is rolled six times. What is the or probability that the die will show an even number exactly 2 times?

10^m10^n is always a factor of 9 if m and n are positive integers?