sum of 20 terms of series 2-4+6-8+10-12+..
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Answered by
21
Answer:
-20
Step-by-step explanation:
Number series : 2 - 4 + 6 - 8 + 10 - 12 + .....
1) Pair two terms together
2) We are finding the sum of 10 pairs
Find the sum of every pair:
2 - 4 = -2
6 - 8 = -2
....
Every pair has a sum of -2
Find the sum of 10 pairs:
1 pair = -2
10 paris = (-2) x 10 = -20
Answer: The sum of 20 terms is -20
Answered by
8
Answer:The Sum cannot be found because the series don't form an AP
Step-by-step explanation:
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