Using numbers from 0 to 9 the number of 5 digit telephone numbers that can be formed is
A) 1,00,000
B) 59,049
C) 3439
D) 6561
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since telephone number may start from 0
we need not exclude it
and also digits can be repeated
_ _ _ _ _
↓ ↓ ↓ ↓ ↓
10 10 10 10 10
10^5 ways
=>
10×10×10×10×10
1,00,000 ways
we need not exclude it
and also digits can be repeated
_ _ _ _ _
↓ ↓ ↓ ↓ ↓
10 10 10 10 10
10^5 ways
=>
10×10×10×10×10
1,00,000 ways
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