Question

Find missing number
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Answer 1

Given:

• A series pattern is given.

          7, 5 = 31

          8, 3, = 81

          9,8 = 72

          7, 7 = ?

To Find:

• Missing number of the series.

Solution:

Following pattern is used in this series

       Let's take 7, 5 = 31

1. First add the digits of the resultant number

       ⇒      3+1 = 4

2. After that subtract the bigger number and add smaller number\

      ⇒    4 - 7 + 5 = 9-7 = 2

Now, for remaining numbers by using above pattern

             8, 3, = 81

      ⇒   (8+1)-(8-3)= 9- 8 + 3 = 4  ( 2×2)

             9,8 = 72

     ⇒   (7+2)-(9-8) = 9 -9 + 8 = 8   (4 × 2)

    7, 7 = ?

Here

    ⇒         ? - 7 -7 = ? (It should be 2 times of 8 = 16)

So the missing number is ( 9 + 7 = 16 )

Thus, the answer is 97

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