The smallest number when increased by " 1 " is exactly divisible by 12, 18, 24, 32 and 40 is: Select the correct option:
A) 1439	B) 1440	C) 1459	D) 1449	E) 1500

Rationale: lcm = 1440 1440 - 1 = 1439 answer : a
Answer: A