CUET Preparation Today
CUET
-- Applied Mathematics - Section B2
Numbers, Quantification and Numerical Applications
If $\phi (n)$ represents Euler quotient function, then what is the value of $\phi (39)$ ?
24
26
28
22
The correct answer is option (1) : 24
$\phi (39) =\phi (3×13)$
$=\phi(3)×\phi(13)$
$=(3-1)(13-12)$
$=24$
