Question

First term and common difference of an AP are 6 and 3 respectively.find S27

Answer 1

Answer:

a = 6

d = 3

n = 27

$S_{27} = \frac{n}{2}( 2a + (n - 1)d )$

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

$S_{27} = \frac{27}{2}( 12 + 26 * 3 )$

$S_{27} = \frac{27}{2}( 12 + 78 )$

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

$S_{27} = 27 * 45$

$S_{27} = 1215$

Answer 2

Answer:

OP ANSWER BRO

Step-by-step explanation: