4. A box contains a total of 100 CDs that were manufactured on two machines. Of them, 60 were manufactured on Machine I. Of the total CDs, 15 are defective. Of the 60 CDs that were manufactured on Machine I, 9 are defective. Let \( D \) be the event that a randomly selected CD is defective, and let A be the event that a randomly selected CD was manufactured on Machine I.

Dalam almari A mmi terdapat beberapa helai baju kemeja-T. I helai berwarna puth, 4 helai berwama hitam, 3 helai berwarna merah dan 3 helai berwarna hijau. Dia memilih schelai baju kemeja-T secara rawak dan didapati kebarangkalian memilih baju hitam ialah \( \frac{2}{9} \). Hitung nilaix: In Azmi's wardrobe, there are few pieces of \( T \)-shirts, \( x \) white shirts, 4 black shirts, 3 red shirts and 3 green shirts. He chooses a \( T \)-shirt at random and the probability of him choosing the black shirt is \( \frac{2}{9} \). Calculate the value of \( x \). A 4 B 6 C 8 D 10

A bag contains green balls and red balls only. A ball is taken at random from the bag. The probability of taking a green ball is 0.38 . Write down the probability of taking a a red ball, b a blue ball.

4. A box contains a total of 100 CDs that were manufactured on two machines. Of them, 60 were manufactured on Machine I. Of the total CDs, 15 are defective. Of the 60 CDs that were manufactured on Machine I, 9 are defective. Let \( D \) be the event that a randomly selected CD is defective, and let A be the event that a randomly selected CD was manufactured on Machine I.

16. En una caja hay 8 témperas, cada una de un color diferente. ¿De cuántas maneras distintas se pueden escoger 2 de estas 8 témperas?

11. One letter is selected from the word "ilovemathematics". What is the probability that a " \( t \) " or an " is chosen?