What will be obtained if 8 is subtracted from the HCF of 168, 189, and 231?
(a) 15
(b) 10
(c) 21
(4) None of these
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The answer is None of these(13)
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answer : option (d) none of these
explanation : first of all, we have to find HCF of 168 , 189 and 231.
HCF of 168, 189 and 231 = common factors of 168 , 189 and 231
prime factors of 168 = 2 × 2 × 2 × 3 × 7
prime factors of 189 = 3 × 3 × 3 × 7
prime factors of 231 = 3 × 7 × 11
common factors of 168, 189 and 231 = 3 × 7 = 21
hence, HCF of 168, 189 and 231 = 21
when we subtract 8 from HCF of 168, 189 and 231 we get , 21 - 8 = 13
hence, option (d) none of these.
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