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Mathematical Skills | Probability

Q. No. 19:There are 2 positive integers X and Y. What is the probability that X+Y is odd?
A :
1/4
B :
1/3
C :
1/2
D :
1/5
Q. No. 20:A 5-digit number is formed by the digits 1,2,3,4, and 5 without repetition. What is the probability that the number formed is a multiple of 4?
A :
1/2
B :
1/3
C :
1/4
D :
1/5
Q. No. 21:If five dice are thrown simultaneously, what is the probability of getting the sum as seven?
A :
15/65
B :
11/65
C :
10/65
D :
5/65
Q. No. 22:Dishant speaks truth in 3/4 cases and Abhishek lies in 1/5 cases. What is the percentage of cases in which both Dishant and Abhishek contradict each other in stating a fact?
A :
60%
B :
35%
C :
20%
D :
15%
Q. No. 23:X1, x2, x3... x50 are are fifty real numbers such that xr < xr=1 for r = 1, 2, 3... 49. Five numbers out ofthese are picked up at random. The probability that the five numbers have x20 as the middle is:
A :
(20C2*30C2)/50C3
B :
(19C2*30C2)/50C5
C :
(19C2*31C2)/50C5
D :
None of these
Q. No. 24:A dice is rolled three times and the sum of the numbers appearing on the uppermost face is 15. The chance that the first roll was a four is :
A :
2/5
B :
1/5
C :
1/6
D :
None of these
Probability
Easy
Moderate
Difficult