2026 NORTHBROOKS P1 Q17

2026 NORTHBROOKS P1 Q17

Secondary 4
4 marks

Cheng Li has five \$1 coins and seven 50 cents coins in her purse.

  1. She takes two coins out of her purse, at random, one after the other, without replacement.
    Find the probability that the two coins are of different value.[2]
  2. She takes three coins out of her purse, at random, one after the other, without replacement.
    Find the probability that the total sum of the three coins taken out is \$2.[2]

Solution:

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Answer:(a) \(\dfrac{35}{66}\) (b) \(\dfrac{21}{44}\).

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