Question

A Kiddy bank contains hundred 50p coins, fifty ₹1 coins, twenty ₹2 coins and ten ₹5 coins. If it is equally likely that one of the coins will fall out when the bank is turned upside down, what is the probability that the coin (i) will be a 50 p coin? (ii) will not be a ₹5 coin?

Answer 1

Hello!

• Total number of outcomes = $\bf{180}$

(i) Number of 50 p coins = $\underline{\sf 50}$

Then,
P (50p coins) = $\dfrac{50}{180} = \red{\bf{\dfrac{8}{18}}}$

(ii) Number of Rs. 5 coins = $\underline{\sf 10}$

Then,
P (not Rs. 5 coin) = $1 - \dfrac{1}{18} = \red{\bf{\dfrac{17}{18}}}$

Cheers!