Probability - Quantitative Aptitude (MCQ) questions for Q. 715

Q.  Tickets numbered 1 to 50 are mixed and one ticket is drawn at random. Find the probability that the ticket drawn has a number which is a multiple of 4 or 7?
- Published on 06 Jul 15

a. 9/25
b. 9/50
c. 18/25
d. None of these

ANSWER: 9/25
 
S = {1, 2, 3, … , 49, 50}
E = {4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 7, 14, 21, 35, 42, 49}
n(S) = 50
n(E) = 18
P(E) = n(E)/n(S) = 18/50
= 9/25

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    Discussion

  • Nil   -Posted on 12 Aug 21
    They made a mistake the answer will 19/50 because they missed 28 in their set which name is 'E'....so that's a wrong answer
  • shivam   -Posted on 11 Oct 20
    Q. Tickets numbered 1 to 50 are mixed and one ticket is drawn at random. Find the probability that the ticket drawn has a number which is a multiple of 4 or 7?
    mistake:- this question has mistake :- E = {4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 7, 14, 21, 35, 42, 49}
    28 is also multiplication of 7 and that number is not there.

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