Question

5. Sum of series : 1+2+3+ …………………… + n is

()

(+1)

2

() ( + 1) ()

(+1)(+2)

2

() none of these.
​

Answer 1

Input : n = 5
Output : 35
Explanation :
(1) + (1+2) + (1+2+3) + (1+2+3+4) + (1+2+3+4+5) = 35

Input : n = 10
Output : 220
Explanation :
(1) + (1+2) + (1+2+3) + .... +(1+2+3+4+.....+10) = 220

Answer 2

Answer:

None of these is the answer for your question.

Step-by-step explanation:

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