Plz i request u to post a solution for this as I don't know the correct answer

A bag contains **3 maths books** and **2 physics books**. A book is drawn at random, if it is of maths, **2 more books of maths together** with this book put back in the bag and if it is of physics it is not replaced in the bag.This experiment is **repeated 3 times**.If **third draw gives maths book**,what is the **probability** that **first two drawn books were of physics**.

## Comments

Sort by:

TopNewestWe have to use Bayes theorem right ? Calculate probability for the four events separately like MMM , MPM , etc. It will be a messy answer – Rohit Shah · 2 years, 4 months ago

Log in to reply

– Tanishq Varshney · 2 years, 4 months ago

ya u r correct,its a question from one of my friends quiz test paperLog in to reply

Is the answer 42/347? – Rajorshi Chaudhuri · 2 years, 4 months ago

Log in to reply

– Kyle Finch · 2 years, 4 months ago

i guess it should be \(\frac{42}{357}\) which is equal to \(\frac{2}{17}\)Log in to reply

@Rajorshi Chaudhuri .. can u post ur method in brief – Tanishq Varshney · 2 years, 4 months ago

i don't know the answerLog in to reply

(5/7)(7/9)=1/3. Similarly for the rest. And out of this we need PPM. – Rajorshi Chaudhuri · 2 years, 4 months agoLog in to reply

– Tanishq Varshney · 2 years, 4 months ago

ok! now i understood, thanx :)Log in to reply