Math, asked by abhisheksanjay2005, 9 months ago

7. Find the sum of 12 terms whose nth term is given by An = 3n+4​

Answers

Answered by Mr00Strange
2

Answer:

Sum of First 12 terms is 282.

Step-by-step explanation:

A_n} =3n+4

A_{1}=3(1)+4 = 7

A_{2}=3(2)+4=10

d=10-7=3

a=7

n=12

Sum of A.P = \frac{n}{2}  (2a+(n-1)d)

                   = \frac{12}{2}(2(7)+(12-1)3)

                   = 6(2(7)+(11)3)

                   = 6(14+33)

                   = 6(47)

                   = 282

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