Question

Find the sum of 20 terms of series 2 - 4 + 6 - 8 + 10-12​

Answer 1

Step-by-step explanation:

the formula is n(n+1)/2

n is the number of term

20×21/2

210

is the answer

Please mark my answer as braniest answer

Answer 2

Answer:

2+2+2+.....n

n=20

Sum= 20/2(4+19(0)

=40