Q: Which number should come next in the series 1-3-6-10-15-?

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10

the answer will be 21

This is the series of square numbers, (16= 4*4). The next number is 5*5=25.

21

The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.

225

it should already have come out

There is no specific number. It all depends on what shows are good. Should a bunch of new series come out on year that nobody likes, many new series will come out to follow. That year, there would be many TV series. However, a year that has many great TV series that everybody watches would have little new series, thus having less TV series that year.

21

There should be 9 books total. The 6th should come out in April 2011.

21

its over but a new series by Riordan should show up around may

21.

1Another AnswerEach number of the series appears to double as the series progresses: 1/12 (x2), 1/6 (x2), 1/3 (x2), 2/3, etc. This being so, the next number in the series would be 4/3 or 1-1/3 (2/3 x 2)..

The series appears to increase as follows: 1 (+3), 4 (+5), 9 (+7), 16,, etc. If so, the next number in the series would be 25 (16 + 9). * * * * * While mathematically equivalent, a simpler description is: 12, 22, 32, 42, 52 ...

how the hell should we know?

99

early 2011

21 since the difference between each number is as in the order of the given pattern. so you add 13+8=21

Noo he doesnt but he should!!!

It's called "the fear" and it should come out in a few months

The Pattern is 1^2- 2^2- 3^2- 4^2- 5^2 or 1 - 4 - 9 - 16 - 25 The next number in the series is 6^2 or 36

This is the Fibonacci Series, where each term is the sum of the previous two. It continues 21, 34, 55 etc

All odd numbers beginning from one, in a series.Also: Starting with 13, add 4 to each digit separately, and continue adding 4 to the result.answear is 2123

Which number should come next at the end of this series: 1, 4, 9, 16?1^2=12^2=43^2=94^2=165^2=25Therefore, the next number should be 25