Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Combinatorics Summation

The sum of the series 1 + 2(a2 + 1) + 3(a2 + 1)2 + 4(a2 + 1)3 + ........... will be:

1
\(\frac 1 {a^4}\)
2
1
3
\(-\frac 1 {a^2}\)
4
-1
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