Question

How many sets can be made from 7 items if there must be at least one item in each set? Explain

Answer 1

Answer:

7*6*5=210. So you get 7∗6∗53∗2∗1 7 ∗ 6 ∗ 5 3 ∗ 2 ∗ 1 = 35 ways.

Answer 2

If one in each then 7 sets full.

If two in each then 3 full and one half set.

If three in each then 2 full and one half set.

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