The HCF of 3240, 3600 and a third number is 36, and their LCM is 24×35×52×72. The third number is
A
24×53×72
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B
22×35×72
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C
23×35×72
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D
25×52×72
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Solution
The correct option is B22×35×72 3240=23×34×5;3600=24×32×52
HCF = 23×32
LCM = 24×35×52×72
Since HCF is the product of lowest powers of common factors third number should have 23×32 as factor LCM is the product of the highest powers of all factors therefore third number should have 35×57 as its factors ∴ Third number = 22×35×72