398-7=391 436-11=425 542-15=527
HCF of 391, 425 and 527 is the largest number that will divide 398, 436 and 542 leaving remainders 7,11 and 15
391=17 x 23 436-11=425=17 x 25 542-15=527=17x 31
HCF is 17
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