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How many sets of answers can there be in five multiple-choice questions with only AB two options?
There are two combinations of five powers, that is, 32 kinds! They are as follows:
1 species no B: AAAAA
Five kinds of a b: AAAAB, AAABA, AABAA, ABAAA, BAAAA.
10 Two types of B: AAABB, ABABBA, ABBAA, BBAAA, AABAB, ABBAABA, BAABAA, BABA.
10 Three B's: AABBB, ABBBA, BBBAA, ABABB, BABBA, ABBBA, BABBA, BABBA, BBAAB.
Five of the four B's: ABBBB, BABBB, BBABB, BBBAB, bbbbbba.
1 five B:BBBBB
1+5+ 10+ 10+5+ 1=32
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