use euclid division alogrithm to find the h c f of 210and 55
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We know that 210>55 so, by Euclid's division algorithm:
a=bq+r
210=55×3+45
55=45×1+10
45=10×4+5
10=5×2+0
The HCF of 210 and 55 is 5
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