How many 3-letters words can be formed using a, b, c, d, e if (i) repetition of letters is not allowed? (ii) repetition of letters is allowed

Question

Philoid · Accepted Answer

any one of 6 letters

any one of the remaining 5 letters

any one of the remaining4 letters

i)if repetition of letters is not allowed then number of many 3-letters words that can be formed using a, b, c, d, e are

5 × 4 × 3=60

any one of 5 letters

ii) if repetition of letters is allowed then number of many 3-letters words that can be formed using a, b, c, d, e are

5 × 5 × 5=125