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 $\phi (77)$ ?
56
60
64
68
The correct answer is option (2) : 60
$\phi (77) = \phi (7×11)$
$=\phi (7) × \phi (11)$
$= (7-1) (11-1)$
$= 6 × 10 = 60 $
