Question

Q) What is the difference between the sum of first 20 terms and the next 20 terms of the arithmetic sequence 6,10,14.....

Answer this question with step by step explanation
Then I will mark as the brainlist.​

Answer 1

Brainliest answer plz mark

Answer:

In the first case

A.P=6,10,14

d=10-6=4

n=20

a=6

S=n/2[2a+(n-1)d]

S=20/2[2*6+(20-1)4]

S =10[11+(19*4)]

S=10[11+76]

S=10*87

S= 870

In the second case

a =6

d=4

n=40

S=40/2{2*6+[40-1]4}

S = 20{11+[39*4]}

S=20{11+156}

S = 20*167

S = 3340

Difference = 3340/870=3.84

Plz mark as the brainliest answer .