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B
15
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C
17
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D
18
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Solution
The correct option is D 18 On prime factorisation of 324, we get
324 = 2 x 2 x 3 x 3 x 3 x 3
= (2 x 3 x 3) x (2 x 3 x 3) = 18 x 18 ⇒324=182 ∴ square root of 324 is 18.