Question

(a) Find the maximum sum of the A.P. 40, 38,
36, 34, 32,​

Answer 1

Answer:

first number =40

common different is -2

Step-by-step explanation:

a+(n-1)d

40+(n-1)-2

40-2n+2

42-2n=0 (let)

42= 2n

2n= 42

n = 42/2

n=21

Answer 2

Answer:

40

Step-by-step explanation:

1)ap=-2

2)formulae=n/2×(n-1)d

n=number of terms

d=difference of the terms

5÷2×4×-2=40