Question

12. Find the sum of first n natural number.
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Answer 1

Answer:

here is your answer

Step-by-step explanation:

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Answer 2

Answer:

n(n+1)/2

Step-by-step explanation:

the formula is n(n+1)/2

for example :–

the question is find the sum of of first 5 natural numbers ?

the answer is :

5(5+1)/2

5(6)/2

30/2

15

by using without formula :

1+2+3+4+5

3+3+4+5

6+4+5

10+5

15