Words with odd numbers of letters
Number Theory
Level
pending
Given the set of English alphabet (26 letters), find numbers of ways to select a set of odd number of different letters?
The answer is 33554432.
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1 solution
number of ways to select one letter = 2 6 C 1
number of ways to select three letters = 2 6 C 3
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Number of all way to select odd number of letters = 2 6 C 1 + 2 6 C 3 + ...... + 2 6 C 2 5 = 2 2 5