Question

Evaluate the summation of 3 n plus 2, from n equals 1 to 14..

Answer 1

well here is a simple method

find the pattern in the terms

n = 1 an = 5

n = 2 an = 8

n = 3 an = 11

the sequence is arthmetic

so find the last term

n = 14 an = 44

then the sum is

1st term + last term

multiply the answer by the number of terms then divide the answer by 2

\[S_{14} =\frac{14}{2} \times(5 + 44)\]

hope it helps

Answer 2

so i should get 343?

Answer 3

I haven't done the solution... I just explained the method...

Answer 4

i got it right by using it so thank youuu