Find the middle term in the expansion of

b) Find the middle term in the expansion of

Solution

We have n = 9 which is odd. Hence there must be 9 + 1 = 10 terms,

which is even. This implies that there are two middle terms. They are

Now,

Again,

Grade XII Mathmatics Importaint Queston with Solution.

a) In an examination paper containing 10 questions, a candidate has to answer 7 questions. If two questions are made compulsory, in how many ways can he choose 7 questions in all? [2]

Solution

If two questions are compulsory, then the candidate has to select 5 questions from the remaining 8 questions. Therefore, he can choose 5 questions from 8 questions in