The smallest number when increased by ” 1 ” is exactly divisible by 12, 18, 24, 32 and 40 is__________?

– by
The smallest number when increased by ” 1 ” is exactly divisible by 12, 18, 24, 32 and 40 is__________?

A. 1439
B. 1440
C. 1459
D. 1449
Explanation:
LCM = 1440
1440 – 1 = 1439