RRB Group-D Model Paper 11 with answers for online practice

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Question : 5 of 100

Marks: +1, -0

The square root of

(10 + √25)(12 – √49)

is:

$4√3$
$3√3$
$5√3$
$2√3$

Solution:

Concept:

We can find $√x$ using the factorisation method.

Calculation:

$√[(10 + √25) (12 - √49)$

$⇒ √(10 + 5)(12 – 7)$

$⇒ √(15 × 5)$

$⇒ √(3 × 5 × 5)$

$⇒ 5√3$

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