32
13
3
23
Correct answer is D
If P = 23 (1−r2n2), find n when r = 13 and p = 1
p = 2(1−r2)3n2 when r = 13 and p = 1
1 = 23 (1−(13)2)n2
n2 = 2(3−1)3×3
n2 = 2×23×3
= 49
n = 49
= 23
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