1.

underset(x to oo) (Lt)( overset(n) underset(r=1) sum-overset(n) underset(r=1) sum2^(r))/(x-2)=

Answer»

N
`(n-i)2^(n)+l`
`(n-1)2^(n)`
`(n-1)2^(n)-1`

ANSWER :B


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