Question

What is the sum of the first 24 terms of the arithmetic sequence 15,10,5,0

Answer 1

Answer:

Step-by-step explanation:

The given sequence is 15,10,5,0,...

Here first term=a=15

Common difference=d=10-15=-5

So the sum of first 24 terms

=24/2[2×15+(24-1)(-5)]

=12[30-23×5]

=12[30-115]

=12(-85)=-1026 .

Hope you got it