Question

Suppose there were m married couples, but that d of these 2m. people have died, Regard the d deaths as striking the 2m people at random. Let X be the number of surviving couples. Find:

Answer 1

The function that represents surviving people are X = 2m - d

Given that there are m married couples and d of the 2m of these couples have died, the total people that remain is expressed as:

Total people remaining = Total married couple - those that died

Total married couple = 2m

Total people that died = d

Taking the difference to get the remaining people;

Total people remaining = 2m - d

Hence the function that represents surviving people are X = 2m - d

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