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Find the sum of the first 13 terms of the sequence 2, 5, 8, 11,....

Answer :

RITMEKSGO

The sum of the first 13 terms is 260

How to calculate the sum of the first 13 terms ?

The first term(a) is 2

The common difference(d) is 3

n= 13

The formular is

n/2(2a + (n-1)d)

= 13/2 [ 2(2) + (13-1)3]

= 6.5 [4 + 12(3)]

= 6.5 [4 + 36]

= 6.5(40)

= 260

Hence the sum of the first 13 terms is 260

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