A) 18
B) 15
C) 25
D) 32
Correct Answer: C
Solution :
It's the combination of two series, 1, 2, 3, 4, 5.......... and \[{{1}^{2}},\,{{2}^{2}},\,{{3}^{2}},\,{{4}^{2}},.....\] etc., the numbers of the two series are placed alternatively.
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