Question

help.
find the first five terms of the arithmetic sequence. use the partial sum formula to find the partial sum of the given arithmetic sequence.
3,5,7,….

Answer 1

Use the formulae
sum of 'n' numbers of a sequence=(n/2)[2a+(n-1)d]
where 'a' is the first term of sequence, and d is the difference between the terms.
Here a=3 n=5 and d=2 , hence the answer is 35