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Let 1 le m lt n le p. The number of subs...

Let `1 le m lt n le p`. The number of subsets o the set `A={1,2,3, . . .P}` having m, n as the least and the greatest elements respectively, is

A

`2^(n-m-1)-1`

B

`2^(n-m-1)`

C

`2^(n-m)`

D

None of these

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