Question

What is the least number which when increased by $1$ is exactly divisible by $12,18,24,32$ and $40?$

• A. $1439$
• B. $1440$
• C. $1449$
• D. $1459$

Answer 1

The correct option is A $1439$

Required number :
L.C.M of $(12,18,24,32,40)-1$
$=1440-1$
$=1439$