Originally Posted by

**Danclansman** Hi, I'm sorry if this forum already has a similar question, but I haven't had a chance to search(and if I did, I'm not sure what I could search for...)

I'm stuck on this question, and I get different results from my friends, but all of the methods kind of make sense.

On a Sunday, there is 70% chance he buys the Sunday Times newspaper (event T) and 35% chance he buys the News of the World newspaper(event N). Furthermore these events are not unrelated, for if he has already bought the times then he only buys the news of the world 20% of the time.

i ) On what proportion of Sundays does he buy both newspapers?

So, I wrote that

P(T)= 0.7

P(N)= 0.35

P(N|T)= 0.2

And then I used the formula

P(N|T) = [P(N (intersection) T]/ T , and re arranged it to find P(N intersection T), which ends up as 0.2 x 0.7, 0.14.

Is this correct?

Do I have to consider that he buys the News of the World and then the Times, in that order?

Thanks