Q2 of 51 Page 18

Mark the correct alternative in the following :

The term without x in the expansion of is


Given:





The term without x is where :



12-3k=0


k=4


for k=4; the term is :




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18

If (1 – x + x2)n = a0 + a1x + a2x2 + … + a2nx2n, find the value of a0 + a2 + a4 + … + a2n.

 1

Mark the correct alternative in the following :

If in the expansion of , the coefficient of rth and (r +4) th terms are equal, then r is equal to


 3

Mark the correct alternative in the following :

If rth term in the expansion of is without x, then r is equal to.


 4

Mark the correct alternative in the following :

If in the expansion of and , the ratio of the coefficients of second and third terms, and third and fourth terms respectively are equal, then n is