At @manu thakur sir notes
This formula given but solution I an not getting .
If miss rate in L1 are 50/500
Then in L2 should be 20/ 500 but in solution it is taken 20/50 how? Please some explain
It is like 500 students appeared for an exam and each student was given 2 chance to clear the exam.
In first round, 50 student were not able to qualify so they go for round 2. i.e. 50/500 didn’t qualified
In round 2, 20 were not able to qualify the exam i.e. 20/50 didn’t qualified. here we are not writing 20/500 because only 50 students gave 2nd round.
I hope you can relate now.