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Find the next number in the series 3,6,9,12,15,...

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answer is C.

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Detailed Solution

The given sequence is an A.P. where $a = 3 a n d d = 3$ we need to find the sixth term.

To find the sixth term in A.P., we will use the formula:

$a_{n} = a + (n - 1) d$

$\begin{matrix} a_{6} = 3 + (6 - 1) 3 \\ a_{6} = 3 + 5 \times 3 \\ a_{6} = 18 \end{matrix}$
The next number is 18.

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