What is the missing number of the series 7, x, 21, 31, 43
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43-31=12
31-21=10
21-x = 8
x -7 should be equal to 6
21- 8=13 and 13 -7=6
thus x = 13
you get the series when you add each multiple of 2 starting from 6
31-21=10
21-x = 8
x -7 should be equal to 6
21- 8=13 and 13 -7=6
thus x = 13
you get the series when you add each multiple of 2 starting from 6
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