calculate the l . c . m of 2 / 5 , 4 / 7 , 3 / 7 , 6 / 13 is :
"required l . c . m = l . c . m . of 2 , 4 , 3 , 6 / h . c . f . of 5 , 7 , 7 , 13 = 12 / 1 = 12 answer is d"
multiply(multiply(2, 4), multiply(3, 6))