log42 =x  হলে x  এর মান কত?

A 1

B 1/2

D 2

Solution

Correct Answer: Option B

log42 =x 
⇒ 4= 2  [loga N = x হলে, ax = N]
⇒ 22x = 21
⇒ 2x = 1
⇒ x = 1/2
 

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