Question

find the sum of 20 term of the AP 5,2,-1-4,-7​

Answer 1

Answer:

-470

Step-by-step explanation:

Hope you will find this useful :)

Answer 2

Answer:

hii

Step-by-step explanation:

your answer is:

here a=5, d=-3,n=20

so by the formula;

S20=20/2 [2*5 +(20-19)(-3)]

= -470