Question

First term and common difference of an A.P. are 6 and 3 respectively ; find S .
a = 6, d = 3, S = ?
∴ S = n
2
[ _____ + (n - 1)d]
∴ S = 27
2
[12 + (27 - 1) _____]
= 27
2
× _____
= 27 × 45
∴ _____

Answer 1

Answer:

12

0

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