() The first term and the common difference of an A.P. are 10 and 5 respectively,
Complete the following activity to find the sum of the first 30 terms of the A.P.
+ (n - 1)d
(
S = ]
:, -20 +63
1520 +
20 + (30 - 1)
= 15 x 165
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Answer:
Sn = n/2 [2a + (n-1) d ]
S30= 30/2 [ 2×10 + (30-1)× 5]
= 15 [ 20 + 28×5].
= 15 × 165
= 2475
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