Question

17. The sum of first 'n' natural numbers is given by the formula
a. Ση =n(n- 1)/
2
b. Ση = n(n+1)/
2
C. Ση =(n-1)/2

d. Σn = (n+1)/
2​

Answer 1

Step-by-step explanation:

d is the correct answer because sum of first n natural numbers is n(n+1)÷2

Answer 2

Answer:

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