Question

Observe the series $2,4,6,8,10$ … and write the generalised formula.

Answer 1

For writing the generalised formula :

Given series $2,4,6,8,10$…

$$\begin{gathered} 2\times 1=2 \\ 2\times 2=4 \\ 2\times 3=6 \\ 2\times 4=8 \\ 2\times 5=10 \\ ....... \end{gathered}$$

We see that we can find other terms of series by the following generalised formula :

$2\times n$, where n denotes the term number.

Hence, the generalised formula is $2\times n$.