Instructions

Choose the correct alternative from the given responses that will complete the series:

Question 36

20, 30, 42,56, 72, ?

Solution

The logic here is

30 - 20 = 10

42 - 30 = 12

56 - 42 = 14

72 - 56 = 16

Difference between successive terms is increasing by 2.

The next difference will be 18.

Hence, next term = 72+18 = 90

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