CUET Preparation Today
If $\phi (n)$ represents Euler quotient function, then what is the value of $\phi (77)$ ? |
3940 950 3840 3740 |
3840 |
The correct answer is option (3) : 3840 $\phi (9650)= \phi ( 2×5^2×193)$ $=\phi (2) ×\phi (5^2)×\phi (193)$ $=(2-1)(5^2-5^1)(193-1)$ $=1× 20 ×192$ $= 3840$ |
