Question

17. Find the HCF of 55 and 210. Express it as linear combination of 55 and
210. i.e., HCF of 55 and 210 = 210 a +55 b for some a and b. [Ans. a = 5,
b = -19)
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Answer 1

if one is exact divisible by second number ...the first one only highest common factor..

so that 55 is HCF OF 55 AND 210