Question

Calculate the sum of first 20 even numbers and indicate the components of computational thinking . please answer I will mark as brainliest ​

Answer 1

Answer:

420

Explanation:

2+4+6+....40

it is an AP with a = 2 and d= 2

some of terms is

n/2(a+l)

20/2(2+40)

420

Answer 2

the first even number is 2.it follows now that the nth term of first 20 number is 2n where n =1,2,3....... 20 .thus,the series is 2,4,6........40.

this series could be visualize as a A.P. series with first term a=2 and d=2 and n=20

the formula for sum is S =n/2(2a+(n-1)d)

=20/2(2×2+20-1)×2)=10(4+19×2)

=10 (4+38)=10×42 =420

please mark me as brainliest