Question

(1)+(1+2)+(1+2+3)....​

Answer 1

Answer:

Given the value of n, we need to find the sum of the series where i-th term is sum of first i natural numbers.

Examples :

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

Step-by-step explanation:

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