Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Combinatorics Summation

Consider an infinite series 1 + r + r2 + r3 + r4 + … ∞, then which of the following statements are incorrect?

1

Series converges for -1 ≤ r ≤ 1 

2
Series diverges for r ≥ 1
3
Series oscillates for r ≤ -1
4
Series converges for -1 < r < 1
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