Question

the ways of selecting 4 letters from the word examination​

Answer 1

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EXAMINATION

E⟶1

X⟶1

A⟶2

M⟶1

I⟶2

N⟶2

T⟶1

O⟶1

Selecting 4 letters

Case : 1 All distict :

8

C

4

Ways=70 Ways

Case : 2 2 letter alike , 2 distict

⇒

3

C

1

×

7

C

2

=63

Case : 3 2 letter alike 2 letter

=

3

C

2

=3

Solution :70+63+3=136

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