Teaching DSSSB PGT Mock Test 2025 Engineering Mathematics Combinatorics Summation

श्रेणी \(\sum {u_n} = \frac{{{x^{2n}}}}{{\left( {n + 1} \right)\sqrt n }}\) केवल निम्न में से किसके लिए अभिसरण करता है?

1

x < 1 और x > 1

2

x ≤ 1 और x ≥ 1

3

-1 < x < 1

4

-1 ≤ x ≤ 1

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