Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Two numbers are selected at random from the numbers 1, 2, ...... n . The probability that the difference between the first and second is not less than m (where 0< m < n ), is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let the first number be 
and second is 
Let 
denotes the event that the difference between the first and second number is at least 
Let 
denote the event that the first number chosen is 
we must have 
or 
Therefore 
and 
Thus 
for 
and 
for 
Also 
Therefore, 
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