1) The H.C.F. of 204, 1190 and 1445 is : A) 17 B) 18 C) 19 D) 21 Answer: Option AExplanation:204 = 22 x 3 x 17 1190 = 2 x 5 x 7 x 17 1445 = 5 x 172 HCF = 17