Choose correct alternative for given relation. 2 : 5fi : : fl : ?

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1.Analogy

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Choose the correct alternative for the given relation.

$2 : 5fi : : fl : ?$

A

$63$

B

$81$

C

$90$

D

$99$

Solution

The relationship is $x: x(x+1)$.

Standard 13

Reasoning

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