Question

if mean of first 'n' natural numbers is 36 . Then find value of 'n'

Answer 1

Answer:

n=71.

Step-by-step explanation:

(1+2+3+4+................+ n)/ n = 36

S= (n/2)(2a+ (n-1) d)

Here, S = 36n.

36n= (n/2)(2*1 + (n-1)1)

72=2+(n-1)

70 = n-1

n=71.

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