IBPS RRB PO 2017

Instructions

What should come in place of the question mark (?) in the following question ?

Question 64

$$62^{2}-32^{2}+(?^{2})=3144$$

Solution

The question can be reframed as,

$$3144-62^{2}+32^{2}=(?^{2})$$

$$3144-3844+1024=324$$

But,

$$18^{2}=324$$

And hence, none of the above is option.

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