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1,1,3,9,6,36,10, 100,(........),225?

Aptitude Quizzes Mathematics Aptitude Test

Question:
1,1,3,9,6,36,10, 100,(........),225

Option A):
20
Option B):
22
Option C):
16
Option D):
15

Correct Answer is Option D):
15

Explanation:
The given sequence is a combination of two series: (I). 1, 3, 6. 10, (.....) (II). 1, 9, 36, 100, 225 ,(.....) The pattern in I is + 2, + 3, + 4, The numbers in (II) are squares of the corresponding numbers of (I) :. Missing number = 10 + 5 = 15.