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QUESTION
1) how many three digits number can be formed from {3,4,5,6,7} if:
1) how many three digits number can be formed from {3,4,5,6,7} if:
a) digits are allowed to be repeated
b)the first digit must be odd, repeats are not allowed
c)the middle number must be greater than 5, repeats are allowed
2) a box contains 11 marbles, 6 are red and 5 are yellow. 4 marbles are drawn.
a) in how many ways can 2 of each color be drawn?
b) in how many ways can at least 3 red be drawn?
