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115.Highest common factor HCF of two consecutive odd numbers is always one 1. Between their factors 1 is common so their highest common factor HCF is 1. Hence their HCF is also 1.
116.HCF of co-prime numbers 4 and 15 was found as follows by factorization: 4 = 2 × 2 and 15 = 3 × 5 since there is no common prime factors, so HCF of 4 and 15 is 0.
117.The lcm of 12 and 18 is 36.
118.To the reasonably mathematically proficient person it should be immediately obvious that the LCM of two co-prime numbers will be the product of those numbers, ie, the result of multiplying them together. So for 2 and 3 the LCM will be 2 x 3 = 6 and for 14 and 33 the LCM will be 14 x 33 = 462.
119. answer is 185.
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