Question

Which number missing
1 9 7 2 5
3 2 9 8 7
5 2 7 1 ?

Answer 1

4 and 6 number missing

Answer 2

3 is missing number

Step-by-step explanation:

1 9 7 2 5

3 2 9 8 7

5 2 7 1 ?

1 + 3  =4  + 1  = 5   Unit digit = 5

9 + 2 = 11 + 1 = 12   Unit digit = 2

7 + 9 = 16 + 1 = 17   Unit digit = 7

2 + 8 = 10 + 1 = 11  Unit digit = 1

5 + 7 = 12 + 1 = 13 unit digit = 3

3 is missing number

logic used

in each column add top two row numbers and then just add 1

and unit digit of resulting number would be number in thrird row in same column

a

b

c

c is unit digit of  (a + b + 1)

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