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Q. Let f1(x)=3x+22x+3,xR{32}
For n2, define fn(x)=f1ofn1(x).
If f5(x)=ax+bbx+a,gcd(a,b)=1, then a+b is equal to ______

JEE MainJEE Main 2023Relations and Functions - Part 2

Solution:

f1(x)=3x+22x+3
f2(x)=13x+1212x+13
f3(x)=63x+6262x+63
f5(x)=1563x+15621562x+1563
a+b=3125