Question 37

Which number will replace the question mark (?) in the following series?
10, 17, 31, 52, 80, ?

Solution

Each term is added with the consequtive multiple of 7.

10+7 = 17

17+14 = 31

31+21 = 52

52+28 = 80

80+35 = 115

So here 115 will come in place of the question mark.

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