find the greatest number which on dividing 1428 and 2206 , leaves a reminder of 9 and 13 respectively
"explanation : in this type of question , its obvious we need to calculate the hcf , trick is hcf of ( 1428 - 9 ) and ( 2206 - 13 ) = hcf ( 1419 , 2193 ) = 129 option c"
gcd(subtract(1428, 9), subtract(2206, 13))