Question

FIND MISSING NUMBER

7

13

?

35

31

37

Answer 1

The missing number is 19

Answer 2

Given,

7,13,?,37,31,35

To Find,

To find the number in place of question mark.

Solution,

Let consider the missing number is X.

Here we can notice that the difference of consecutive terms of given series: 7 , 9 , 13 , X , 37, 31 , 35 forms a G.P.: 2, 4, 8, 16, 32, as follows

9−7=2

13−9=4

X−13=8

∴X=13 + 8 = 21

37−21=16

(9+ 4 =13

13 + 8 =21

21+ 16 =37)

Hence , the required missing number will be 21.

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