Question

11. Find the sum of the first 20 terms of
series 1 +2 +3 + ....​

Answer 1

Answer:

110

Step-by-step explanation:

you can add like this

9+1

8+2

7+3

6+4

5+0 do in the second term also

Answer 2

Answer:

this will be

FROM RELATION

N(N+1)/2=20(20+1)/2=20*21/2=210

THUS, sum of the series of first 20 terms is 210.

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