Question

First term and common difference of an A.P. are 6 and 3 respectively;find S27​

Answer 1

GIVEN :

First term = a = 6

Common difference = d = 3

TO FIND :

S27 = ?

SOLUTION :

$Sn = \frac{n}{2} (2a(n - 1)d)$

S27 = 27 [ 2×6 (27-1)3]

2

= 27 [ 12 (26)3]

2

= 27 [ 12 × 78]

2

= 27 × 936

2

= 27 × 468

= 12636

S27 = 12636

ANS The sum of the 1st 27 terms are 12636

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