The least number which when increased by 7 each divisible by each one of 24, 32, 36 and 54 is :  Choose the correct option
A) 857
B) 859
C) 869
D) 4320
E) none of these

Rationale: "solution required number = ( l . c . m . of 24 , 32 , 36 , 54 ) - 7 = 864 - 7 = 857 . answer a"
Answer: A