calculate the l . c . m of 1 / 5 , 6 / 7 , 5 / 6 , 3 / 5 is :
"required l . c . m = l . c . m . of 1 , 6 , 5 , 3 / h . c . f . of 5 , 7 , 6 , 5 = 30 / 1 = 30 answer is b"
multiply(multiply(1, 6), multiply(5, 3))