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The smallest natural number by which 53240 must be DIVIDED to make the quotient a perfect cube is:
A3
B5
C11
D55
Answer & Solution
Correct answer: B. 5
Prime factorise: 53240 = 2³ × 5 × 11³. The prime 5 appears only once. Dividing by 5 leaves 2³ × 11³ = (2 × 11)³ = 22³ = 10648 — a perfect cube. So smallest divisor is 5.
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