Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2015 | Oct-Nov | (P1-9709/11) | Q#1
In the expansion of , where a is a non-zero constant, show that the coefficient of is zero.
Expression for the Binomial expansion of is:
We are given;
In the given case:
It is evident that to get the terms containing in the product of we need;
This will result in terms containing ;
Hence coefficient of in the expansion of .