Use euclid's division algorithm to find h.c.f.of 870and 225.
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a=bq+r
a=870. b=225
870=225*3+195
a=225. b=195
225=195*1+30
a=195. b=30
195=30*6+15
a=30. b=15
30=15*2+0
so HCF of 870,225 is 15
a=870. b=225
870=225*3+195
a=225. b=195
225=195*1+30
a=195. b=30
195=30*6+15
a=30. b=15
30=15*2+0
so HCF of 870,225 is 15
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