Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Combinatorics Summation

If (1+ x + x2)n = \(\rm\displaystyle\sum_{r = 0}^{2 n}\) ar xr, then a1 − 2a2 + 3a3 − …. −2n a2n is

1
(n + 1)2n
2
n
3
−n
4
n(2n)
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