Instructions
In question numbers 17 to 24, select the related word/letters/number from the given alternatives.
Solution
Expression = 42 : 20 :: 64 : ?
The pattern followed is = $$n:\frac{n}{2}-1$$
Eg :- $$42:\frac{42}{2}-1=42:20$$
Similarly, $$\frac{64}{2}-1=32-1=31$$
=> Ans - (C)
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