Question 43

Select the number from among the given options that can replace the question mark (?) in the following series.
21, 23, 20, 22, 19, 21, ?

Solution

21+2 = 23

23-3 = 20

20+2 = 22

22-3 = 19

19+2 = 21

21-3 = 18

Here 18 will come in place of the question mark.


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