1plz reply quickly
d probability dat 2 frnds will b able to meet each other between 'a' hours & 'b' hours not waiting for each other more than 'c' hours is ?
if 3 squares are selected at random on a chess board den d probability datdey lie on a diagonal line is?
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12 Answers
1@ sriraghav i think the ones for the selection for 8C3 there will be only two diagonals so for them it shud be 2*8C3
1oh yes... other quantities appears 4 times, but 8C3 appears only 2 times
9draw the graph with x axis and y axis as times of frnds
now x,y≤ b- a ..........1
|x-y|≤c ........2
Prob = Area2/Area 1
33hey check this out..
same question:
http://targetiit.com/iit_jee_forum/posts/one_more_ques_on_probability_125.html