defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Binomial Theorem Summation of Combination Terms
In the expansion of (x + a)n, the sum of odd terms is P and sum of even terms is Q, n ∈ I+, then {(x + a)2n + (x − a)2n} equals :
1
2(P2 − Q2)
2
4PQ
3
P2 + Q2
4
2(P2 + Q2)