Question

solution plzzzzzz guysssss​

Answer 1

Answer:

-800

Step-by-step explanation:

Given nth term = (7-3n)

SO, a1 = 7- 3(1) = 4

a2 = 7- 3(2) = 7-6 = 1

d = a2 - a1 = 1 - 4 = -3

S(25) = n/2 {2a1 +(n-1)x d}

S(25) = 25/2 {2(4) + 24x(-3)

S(25) = 25/2 {8 - 72}

S(25) = 25/2 x -64

S(25) = 25 x -32

S(25) =  -800