Question

Determine the number of ways of selecting one or more letters from the letters BBBBBB?

(a) 6

(b) 73

(c) 23

(d) 56

I had been asked this question in semester exam.

I need to ask this question from Counting in chapter Counting of Discrete Mathematics

Answer 1

Right choice is (a) 6

To explain I would say: The number of ways of selecting one ‘B’s = 1, selecting two ‘B’s = 1, selecting three ‘B’s = 1, selecting four ‘B’s = 1, selecting five ‘B’s = 1 and selecting six ‘B’s = 1. Hence, the required number of ways = 6.