Question

Permutations and combination math 30 question!

How many different combinations of 3 letters can be made using all 26 letters in the alphabet?

a) 15 600

b) 2600

c) 23

d) 69

Answer 1

The answer is 2,600

Explanation:

nCr=n!/r!(n-r)!

26C3=26!/3!(26-3)!

=26!/3!(23!)

= 2600