Unformatted text preview: Total number of balls =30. 20 30 · 19 29 · 18 28 · 17 27 · 16 26 · 10 25 · 24 24 · 23 23 · 22 22 · 21 21 = 0 . 0435 . 5. Ex. I2.1 (5 pts) . True. P ( A ∪ B ) = P ( A ) + P ( B )P ( A ∩ B ) = . 5 + . 25P ( A ∩ B ) ≤ . 75 . 6. Ex. I2.4 (5 pts) . True. P (2nd is even)= P (1st is odd and 2nd is even) + P (1st is even and 2nd is even)= 50 100 · 50 99 + 50 100 · 49 99 = 1 2 . 7. Ex. I2.5 (5 pts) . True P (CHEESE) = 1 6 · 1 5 · 3 4 · 2 3 · 1 2 · 1 1 = 0 . 0083 < . 5 . Purdue University hw2˙print.tex; Last Modiﬁed: January 30, 2011 (Prof. Sharabati)...
View
Full
Document
 Spring '08
 Staff
 Probability

Click to edit the document details