find the greatest number that exactly divides 35 , 91 and 840 ?
"the greatest number that exactly divides 35 , 91 and 840 is the hcf of the three numbers . so , calculating hcf we get the answer 7 . answer : c"
gcd(gcd(subtract(subtract(840, 91), 35), subtract(91, 35)), subtract(840, 91))