1.

Thecoefficients of the (r– 1)th,rthand (r +1)thterms in the expansion of(x+ 1)nare in the ratio 1:3:5. Find nand r.

Answer»

The
coefficients of the (
r
– 1)
th,
rth
and (
r +
1)
th
terms in the expansion of


(x
+ 1)
n
are in the ratio 1:3:5. Find
n
and
r.



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