questionr
Early access
Exams
Joint Entrance Examination
Mathematics
Probability
Question 280
Question 280 of 417
Medium
MCQ
Probability A speaks truth is
4
5
\dfrac45
5
4
, for B is
3
4
\dfrac34
4
3
. Find the probability they contradict each other.
A
4
/
5
4/5
4/5
B
1
/
5
1/5
1/5
C
7
/
20
7/20
7/20
D
3
/
20
3/20
3/20
Check answer
Press A-D to select · Enter to check
Solutions · 1
Post your solution
Official solution
\[P = \frac45\times\frac14+\frac15\times\frac34 = \frac{4+3}{20}=\frac{7}{20}\]
Answer the question to unlock
Previous
Next