13 6 7 9 20 47.5 ?
a) 149.5
b) 140.5
c) 150.5
d) 147.5
e) 145.5

1 Answer

Answer :

The series is × 0.5 – 0.5, × 1 + 1, ×1.5 – 1.5, ×2 + 2, ...
Answer: e)

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