Select the related number from the given alternatives..
39 : 52 :: 51 : ?
1). 53
2). 40
3). 68
4). 38
Expression $= 39 : 52 :: 51 : ?$
The pattern followed is $= 3n:4n$, where n is a natural number
Eg $= 3(13):4(13)=39:52$
Similarly, 3n=51
$=\frac{51}{3}=17$
Thus, missing number $= 4\times17=68$
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