a, b, c are positive integers forming an increasing G.P. whose common ratio is a natural number, b – a is a cube of natural number and log6a+log6b+log6c=6, then a + b + c is divisible by
A
3
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B
5
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C
7
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D
9
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Solution
The correct options are A 3 C 7 log6abc=6 abc=66⇒b3=66 b - a is cube of a natural number b = 36, a = 9, c = 144 a + b + c = 189 which is divisible by 3 and 7