簡單數學問題簡單數學問題(3)

1. If A(0, 3), B(0, -3) and C(4, 0) are the vertices of ΔABC, then the coordinates of the in-centre of ΔABC are?

2. A bag contains two $2 coins, four $1 coins and three 50¢ coins. If two coins are drawn at random from the bag, then the probability that the amount of the coins drawn is less than $2 is?

3. Three fair dice are thrown. It is given that all the numbers thrown are the same. Find the probability that all the numbers thrown are odd.


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