Teaching DSSSB PGT Mock Test 2025 Mathematics Sequences and Series

If y = x – x2 + x3 – x4 + _________ ∞, then x = 

1
\(\frac{y}{1\; - \;y}\)
2
\(\frac{1\; + \;y}{y}\)
3
\(\frac{1 \;- \;y}{y}\)
4
\(\frac{y}{1 \;+\; y}\)
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