1.

If a be the arithmetic mean and b,c be the two geometric means between any two positive numbers, then (b3 + c3) /abc equals (a) (ab)1/2/c (b) 1 (c) a2c/b (d) None of these

Answer»

Correct option (d) None of these    

Explanation: 

Solve by taking values and checking with the options. If we take the numbers as 1 and 8, we would get a = 4.5 and b and c as 2 and 4 respectively. Then (b3 + c3)/abc =2. None of the first three options gives us a value equal to 2.



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