What Digit Is At ? in This Series 57431 12265 665? 12

Check the series and find the relationship between the numbers.


Find the value of ?

57431

12265

665?

12

what digit is at ?


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Answer: 7

Explanation:

Sum of numbers in
10,000’s place = 5 + 1 = 6
1,000’s place   = 7 + 2 + 6 = 15 = 1 + 5 = 6
100’s place      = 4 + 2 + 6 = 12 = 1 + 2 = 3
10’s place        = 3 + 6 + 5 + 1 = 15 = 1 + 5 = 6
1’s place          = 1 + 5 + ? + 2

By symmetry (6 6 3 6 ?) of the numbers, sum in 1’s place must be 6.

Only if ? is 7, sum would add up to 6.

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