Question

31,23,90,43,11 and 12,91,83,61,72 and 33,44,62,22,?

Answer 1

Given : 31,23,90,43,11 and 12,91,83,61,72 and 33,44,62,22,?

To Find : Missing number

Solution:

31,23,90,43,11 and 12,91,83,61,72 and 33,44,62,22,?

31,23,90,43,11

reverse 1st   and last two numbers digits

31  = 13

23 = 32

43 = 34

11  = 11

Add all   13 + 32 + 34 + 11 = 90  ( middle term)

12,91,83,61,72

reverse 1st  and  last two numbers digits

12 = 21

91 = 19

61 = 16

72 = 27

Add all 21 + 19  + 16 + 27  = 83    ( middle term)

33,44,62,22, ?

Let say ? = AB

33 = 33

44 = 44

22 = 22

AB  = BA

=> 33 + 44 + 22 + BA = 62

=> 99 + BA = 62

=> BA = - 27

=> AB = - 72

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