Question

(b)
For all positive integers of n, the value of 1 + 2 + 3 + ............... + n will be :
A) n(n+1) (2n+1)/6

B) n(n+1)/2

C) n(n-1)/2

D) (n(n+1)/2)^2
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Answer 1

Answer:

b

Step-by-step explanation:

it is in math text book i told you by seeing it