If 2028 is the product of two natural numbers having two digits each and 13 is their highest common factor, then the numbers are
A
26,78
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B
13,156
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C
36,58
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D
39,52
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Solution
The correct option is D39,52 Let x and y be two numbers. Given 2028=x×y Also known that HCF of x and y is 13. We know H.C.F × L.C.M =2028 Hence, LCM=156, but we want a 2 digit number. 2028 can be expressed differently such as, 2028=13×156 2028=26×78 ; here, HCF of 26 and 78 is 26 itself. 2028=39×52, where the HCF of
52 and 39 is 13. Hence, the numbers are 39 and 52.