In each of the following questions, sele...

In each of the following questions, select the related letters/word/number from the given alternatives.
6:11 :: 11 : ?

A

6

B

17

C

20

D

30

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The correct Answer is:

C

`6 xx 2 - 1 =11`
Similarly , `11 xx 2 -2 = 20`

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