Take ‘the birthday problem’, for instance. It simply asks: how many people would you need to get into the same room in order to statistically assure that at least two share the exact birth month and day? Given that there are 365 days in a non-leap year, and that most people you know probably don’t have the same birthday, you might reasonably suppose that you’d need quite a high number to find an exact match. Hundreds, perhaps, and even then you’d be lucky to find two people with the same birth month and day. Statistically, however, you need only 23 people in the room for a greater than 50 per cent (hence ‘statistically probable’) chance of finding two people with the exact same birth month and day. For a 99.9 per cent chance, you need only 70 people.

Which of the following options puts forth the main idea of this paragraph best?

Statement: The average family income in the metros has increased today as compared to earlier,as in most families these days husbands and wives both are working.

Which of the following inferences cannot be drawn from the above statement?

Should powerful nations attack relatively weaker nations which pose probable danger to world peace ?

Arguments:
1. Yes. War is justified for the noble purpose of peacekeeping.
2. No. War/violence should never be resorted to.