1.Relation and Function
hard

ધારો કે $f ^1( x )=\frac{3 x +2}{2 x +3}, x \in R -\left\{\frac{-3}{2}\right\}$ છે. $n \geq 2$, માટે $f ^{ n }( x )= f ^1 0 f ^{ n -1}( x )$ પ્રમાણે વ્યાખ્યાયિત કરો.જો $f ^5( x )=\frac{ ax + b }{ bx + a }, \operatorname{gcd}( a , b )=1$, જ્યાં $a$ અને $b$ પરસ્પર અવિભાજ્ય છે,તો  $a+b=............$.

A

$3124$

B

$3123$

C

$3126$

D

$3125$

(JEE MAIN-2023)

Solution

$f^1(x)=\frac{3 x+2}{2 x+3}$

$\Rightarrow f^2(x)=\frac{13 x+12}{12 x+13}$

$\Rightarrow f^3(x)=\frac{63 x+62}{62 x+63}$

$\therefore f^5(x)=\frac{1563 x+1562}{1562 x+1563}$

$a+b=3125$

Standard 12
Mathematics

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