Question

PRACTICE SET 3.3
Fist term and common difference of an A.P. are 6and 3 respectively ; find S 27

a=6, d=3,S 27 =?
Sn=n/2 [?+(n-1)d]
S27 = 27/2 [12+(27-1)?]
=27/2 x ?
27 x 45 = ?​

Answer 1

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Answer 2

Step-by-step explanation:

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