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### Q & A

Q: Is it advisable to complete the course or do whatever is possible in the limited time well? Please elaborate.

A: It is not necessary to complete the course. It is highly recommended that you do whatever you can in the time available to you thoroughly. A topic which is not done well is as good as topic not done at all. This year many school toppers could hardly score 20% marks or less in Maths. You can imagine that a school topper in all probability would have completed the course. But what is the use? For JEE, it is the depth that matters and not just the width.

However, do not omit certain topic which forms the backbone of the subject.

### Sum of the coefficients in the expansion of $(x+y)^n$ ....

If the sum of the coefficients in the expansion of $(x+y)^n$ is 4096, then the greatest coefficient in the expansion is _ _ _ _ . Solution $C_0 + C_1 + C_2 + C_3 + ......................... + C_n =4096$ $\therefore 2^n = 4096 =2^{12}$ $\Rightarrow n = 12$ Greatest coefficient = ${}^{12}{C_6} = 924$