Question 26

Select the number that can replace the question mark (?) in the following series.
15, 30, 44, 57, 69, ?

Solution

In each term from the left end 15, 14, 13, 12, and 11 will be added to get the next one.

15+15 = 30

30+14 = 44

44+13 = 57

57+12 = 69

69+11 = 80

Hence 80 will come in place of the question mark.

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Select the number that can replace the question mark (?) in the following series.15, 30, 44, 57, 69, ?