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What is the next number in series ?

0 votes
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1 , 3 , 6 , 10 , 15 , ??

posted Oct 6, 2014 by Pankaj Deshmukh

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2 Answers

+2 votes

21
1+2
3+3
6+4
10+5
15+6

answer Oct 6, 2014 by Muniprasad
0 votes

21..
15+6 = 21

answer Dec 8, 2014 by Chirag Gangdev
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