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JEE Main 202324 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
24 January
Shift
Evening Shift
Subject
Mathematics
Chapter
Functions

JEE Main 2023 · 24 January · Evening Shift · Mathematics · Functions

If f(x) = 2 ^ 2x 2 ^ 2x + 2 , x ∈ R , then f((1)/(2023)) +...

If f(x)=22x22x+2f\left(x\right) = \dfrac{{2}^{2x}}{{2}^{2x} + 2}, x∈Rx \in R, then f(12023)+f(22023)+f(32023).........f(20222023)f\left(\dfrac{1}{2023}\right) + f\left(\dfrac{2}{2023}\right) + f\left(\dfrac{3}{2023}\right) . . . . . . . . . f\left(\dfrac{2022}{2023}\right) is equal to

Options

  1. A20112011
  2. B10101010
  3. C20102010
  4. D10111011

Correct answer

D. 10111011

Step-by-step solution

Given,

f(x)=22x22x+2f\left(x\right) = \dfrac{{2}^{2x}}{{2}^{2x} + 2},

so f(1−x)=22−2x22−2x+2=2222+22x+1=22+22xf\left(1 - x\right) = \dfrac{{2}^{2 - 2x}}{{2}^{2 - 2x} + 2} = \dfrac{{2}^{2}}{{2}^{2} + {2}^{2x + 1}} = \dfrac{2}{2 + {2}^{2x}}

Now f(x)+f(1−x)=22x22x+2+22+22x=1f\left(x\right) + f\left(1 - x\right) = \dfrac{{2}^{2x}}{{2}^{2x} + 2} + \dfrac{2}{2 + {2}^{2x}} = 1

So by using the relation f(x)+f(1−x)=1f\left(x\right) + f\left(1 - x\right) = 1 we will solve the given equation

f(12023)+f(22023)+f(32023).........f(20222023)f\left(\dfrac{1}{2023}\right) + f\left(\dfrac{2}{2023}\right) + f\left(\dfrac{3}{2023}\right) . . . . . . . . . f\left(\dfrac{2022}{2023}\right)

=f(12023)+f(20222023)+f(22023)+f(20212023)+f(32023)+f(20202023).........f(10112023)+f(10122023)= f\left(\dfrac{1}{2023}\right) + f\left(\dfrac{2022}{2023}\right) + f\left(\dfrac{2}{2023}\right) + f\left(\dfrac{2021}{2023}\right) + f\left(\dfrac{3}{2023}\right) + f\left(\dfrac{2020}{2023}\right) . . . . . . . . . f\left(\dfrac{1011}{2023}\right) + f\left(\dfrac{1012}{2023}\right)

=f(12023)+f(20222023)⏟1+f(22023)+f(20212023)⏟1+f(32023)+f(20202023)⏟1.........+f(10112023)+f(10122023)⏟1= \mathop{\mathop{f\left(\dfrac{1}{2023}\right) + f\left(\dfrac{2022}{2023}\right)}_{⏟}}_{1} + \mathop{\mathop{f\left(\dfrac{2}{2023}\right) + f\left(\dfrac{2021}{2023}\right)}_{⏟}}_{1} + \mathop{\mathop{f\left(\dfrac{3}{2023}\right) + f\left(\dfrac{2020}{2023}\right)}_{⏟}}_{1} . . . . . . . . . + \mathop{\mathop{f\left(\dfrac{1011}{2023}\right) + f\left(\dfrac{1012}{2023}\right)}_{⏟}}_{1}

=1+1+1.........1011times=1011= 1 + 1 + 1 . . . . . . . . . 1011\text{times} = 1011

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