Question

solve the 2question fast

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer :

$S_{27}$ is equal to 1215.

Step-by-step explanation :

Given,

First term, $a=6$

Common difference, $d=3$

$n=27$

$S_{27}=?$

In order to find $S_{27}$, we need to use the following formula -

$S_{n}=\frac{n}{2}[2a+(n-1)d]$

$S_{27}=\frac{27}{2}[2\times 6+(27-1)3]$

$S_{27}=\frac{27}{2}[12+(27-1)3]$

$S_{27}=(\frac{27}{2}\times 90)$

$S_{27}=(27\times 45)$

$S_{27}=1215$