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The highest common factor of 21 and 90 is _________(a) 3(b) 2(c) 1(d) 4This question was addressed to me in an interview for internship.Enquiry is from Real Numbers topic in chapter Real Numbers of Mathematics – Class 10

Answer»

Correct CHOICE is (a) 3

Explanation: 21 can be written as 3 × 7 × 1 and 90 can be written as 3 × 3 × 2 × 5.

HCF is the product of smallest POWER of each prime factor involved in the numbers.

Therefore, HCF = 3 × 1 = 3



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