Quantrex Academy · Free JEE Advanced PYQ solutions
JEE Advanced Mathematics Probability 2021 JEE Advanced 2021 (Paper 2)

JEE Advanced Mathematics Question (2021) — Solution

Question

A number is chosen at random from the set  1 , 2 , 3 , … , 2000 . Let  p  be the probability that the chosen number is a multiple of 3 or  7 . Then the value of  500 p  is ____.

Options

  1. A. A
  2. B. B
  3. C. C
  4. D. D

Answer

A. A

Step-by-step solution

Multiple of 3 = 3 , 6 , 9 … . 1998  are  666 Multiple of 7 = 7 , 14 … . 1995  are  285 Multiple of 21 = 21 , 42 … 1995  are  95 p = 666 + 285 - 95 2000 = 856 2000 = 214 500 = p 500 p = 214

Practice more on Quantrex App →

Related: Mathematics — Probability · All PYQ Banks