A student taking an examination is required to answer exactly 10 out of 15 questions. (a) In how many ways can the 10 questions be selected? 3003 ways (b) In how many ways can the 10 questions be selected if exactly 2 of the first 5 questions must be answered? 1485 X ways

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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A student taking an examination is required to answer exactly 10 out of 15 questions.
(a) In how many ways can the 10 questions be selected?
3003
ways
(b) In how many ways can the 10 questions be selected if exactly 2 of the first 5 questions must be answered?
1485
X ways
Transcribed Image Text:A student taking an examination is required to answer exactly 10 out of 15 questions. (a) In how many ways can the 10 questions be selected? 3003 ways (b) In how many ways can the 10 questions be selected if exactly 2 of the first 5 questions must be answered? 1485 X ways
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