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In each of the following questions, sele...

In each of the following questions, select the related letters/word/number from the given alternatives.
13:19: :21:?

A

41

B

81

C

141

D

14

Text Solution

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The correct Answer is:
A
`(1)^2 = 1 , (3)^(2) = 9 implies 19` Similarly , `(2)^(2) = 4 , (1)^(2) =1 implies 41`
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