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Answer :
Total number of coins in the piggy bank = 100 + 50 + 20 + 10 = 180
\(\therefore \) Total number of elementary events = 180
(i) There are one hundred 50 paise coins in the piggy bank.
\(\therefore \) Favourable number of elementary events = 100
Hence, P(falling out of a 50p coin) \( = \ \frac{100}{180} \ = \ \frac{5}{9} \)
(ii) There are 100 + 50 + 20,i.e., 170 coins other than Rs 5 coin.
\(\therefore \) Favourable number of elementary events = 170
Hence, P(falling out of a coin other than Rs 5 coin)
\( \frac{170}{180} \ = \ \frac{17}{18} \)