In the sum for which digit does the symbol stand ........

Math and Mental Ability Number System

In the sum

for which digit does the symbol stand?

This questions was previously asked in

Complete-Test, Previous year (2020)

Sol. Ans.(b) Working backwards from options is the right technique here.

Option (a) will give –

2 + 12 + 52 + 22 + 21 = 109 (which is not 122). So option (a) is wrong.

Option (b) gives us –

3 + 13 + 53 + 33 + 31 = 133. So option (b) is correct.

At the most, in any question, you will need to check three options, and if first three are wrong, then fourth has to be right (no need to check).

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