Four quantities are such that their arithmetic mean (A.M) is the same as the A.M.

Four quantities are such that their arithmetic mean (A.M) is the same as the A.M. of the first three quantities. The fourth quantity is
(a) Sum of the first three quantities
(b) A.M. of the first three quantities
(c) (Sum of the first three quantities)/4
(d) (Sum of the first three quantities)/2

Anurag Mishra Professor Asked on 12th January 2016 in General Knowledge.
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    Answer: (b) A. M. of the first three quantities 

    Anurag Mishra Professor Answered on 13th January 2016.
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