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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