Q17 of 51 Page 18

Write the total number of terms in the expansion of .

Given:

So odd powers of x cancel each other, we are left with even powers of x or say odd terms of expansion.

So total number of terms are T₁,T₃,…T₉₉,T₁₀₁

=51

Find the number of terms in the expansion of (a + b + c)ⁿ.

If a and b are the coefficients of in the expansions and respectively, find .

If (1 – x + x²)ⁿ = a₀ + a₁x + a₂x² + … + a_2nx²ⁿ, find the value of a₀ + a₂ + a₄ + … + a_2n.

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