An urn contains n m balls, of which n are red and m are black. They are withdrawn from the urn, one at a time and without replacement. Let x be the number of red balls removed before the first black ball is chosen. We are interested in determining e[x]. To obtain this quantity, number the red balls from 1 to n. Now define the random variables xi , i

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

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