1.

The coefficient of three consecutive terms in the expansion of (1+x)n are in the ratio 1 : 7 : 42. Find r and n. Also, determine the square root of n + 1-r. Or Find the coefficient of the term independent of x in the expansion of (x+1x23−x13+1−x−1x−x12)10.

Answer»

The coefficient of three consecutive terms in the expansion of (1+x)n are in the ratio 1 : 7 : 42. Find r and n. Also, determine the square root of n + 1-r.

Or

Find the coefficient of the term independent of x in the expansion of (x+1x23x13+1x1xx12)10.



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