How many pairs of letters in the word “ASUS” whose positional values when added result in multiples of 10?

How many pairs of letters in the word “ASUS” whose positional values when added result in multiples of 10? Correct Answer Four

Given word: ASUS

Their mapping with places is as shown,

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A + S1 = 1 + 19 = 20, Multiple of 10

A + S2 = 1 + 19 = 20, Multiple of 10

U + S1 = 21 + 19 = 40, Multiple of 10

U + S2 = 21 + 19 = 40, Multiple of 10

Therefore there are a total of 4 possible pairs which results as multiple of 10 when added.

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