In each of the following question some words are given which are related in some way. The same relationship obtains among the words in one of the four alternatives given under it. Find the correct alternative.
9, 15, 21?
Options:
A . 4,8,12
B . 10, 14, 16
C . 7, 21, 28
D . 5,10,25
Answer: Option A Answer: (a) In each set, ${1st number + 3rd number/2}$ = 2nd number
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