First slide

Permutations

Question

Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. The number of words which have at least one of their letter repeated is

Moderate

A

69760
B

30240
C

99748
D

none of these

Solution

The required number of words $= 10^{5} -^{10} P_{5}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App