(5n+2 + 35 X 5n-1)/ (4 X 5n) এর মান কত?

(5ⁿ⁺²+ 35 X 5^n-1)/ (4 X 5ⁿ) এর মান কত?

A 4

B 8

C 5

D 7

Solution

Correct Answer: Option B

(5ⁿ⁺² + 35 X 5^n-1)/ (4 X 5ⁿ)

= (5ⁿ.5² + 35 X 5ⁿ.5^-1)/ (4 X 5ⁿ)

= 5ⁿ (5² + 35.5^-1)/(4 X 5ⁿ)

= (25 + 7)/4

= 8