1, 5, ?, 66, 280…

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1, 5, ?, 66, 280…

A20

B18

C22

D26

Answer:

B. 18

Read Explanation:

1, 5, ?, 66, 280

1 x (1+4) = 5

2 x (5+4) = 2 x 9 = 18

3 x (18+4) = 3 x 22 = 66

4 x (66+4) = 4 x 70 = 280

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