Correct option is B
Given arithmetic series:
-5, -3, -1, 1, …
First term (a) = -5
Common difference (d) = 2
Common difference (d) = 2
Formula used:
aₙ = a + (n − 1)d
aₙ = a + (n − 1)d
Given: aₙ = 15
15 = -5 + (n − 1) × 2
15 = -5 + 2n − 2
15 = 2n − 7
2n = 22
n = 11
15 = -5 + 2n − 2
15 = 2n − 7
2n = 22
n = 11
Thus, correct option is (b).
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