defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Binomial Theorem Binomial Expansion
If in the expansion of (1 + x)p (1 – x)q, the coefficients of x and x2 are 1 and –2, respectively, then p2 + q2 is equal to :
1
8
2
18
3
13
4
20