যদি 3x + 3x + 3x = 3n হয় তবে, n এর প্রেক্ষিতে x এর মান কত?

A n + 1

B n + 2

C n - 1

D n - 2

Solution

Correct Answer: Option C

3x + 3x + 3x =3n
⇒ 3x(1 + 1 + 1) = 3n
⇒ 3x.3 = 3n
⇒ 3x + 1 = 3n
⇒ x + 1 = n
⇒ x = n - 1

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