Question

U
First term and common difference of an
AP are 6 and 3 respectively. Find 527
9
Sn-2 [I
+(n-id
Sn = 27 [ 12+(276-1)
11
2
6=27 X
2
- 27X45​

Answer 1

Given a=6d=3

S27  =  n/2  [2a+(n−1)d]

S27  =  2 7/2​ [2×6+26×3]

       =  27 /2 [12+78]

       =  27 /2 [90]

       =27*45

       =1,215

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