Question 30

Which number will replace the question mark (?) in the following series?
15, 17, 20, 25, 32, 43, ?

Solution

Prime numbers are added in each term to obtain the next one.

15+2 = 17

17+3 = 20

20+5 = 25

25+7 = 32

32+11 = 43

43+13 = 56

Hence 56 will come in place of the question mark.

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