Find hcf by using euclids division algorithm or lemma of 455,42
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455 and 42
a=b*q + r where 0≤r<b
a=455 , b=42
455=42*10+35
a=42 , b=35
42=35*1 + 7
a=35 , b=7
35= 7*5 +0
H.C.F of (455,42) is 7
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