Question

Today is SEWA period day. Different activities are performed by the students
according to their choice. Three topics were given 'Swachchh Bharat, 'Swasth
Bharat' and Plastic Mukt Bharat'. Three students have to give their presentations.
Teacher told the students that out of 17 cards one card will be drawn and the
student of that roll number will give the presentation. To be fair cards numbered
1, 2, 3, ......, 17 are put in a box and mixed thoroughly. One card is drawn from
the box
(1) how many possible outcomes are there? |
(ii) what are favourable outcomes for a prime number? 7 7
(iii) what is the probability that a student with composite roll number will give
the presentation? 9​

Answer 1

9/17 is probability that a student with composite roll number will give the presentation

Step-by-step explanation:

Numbers are from

1 to 17

Total Numbers 17

possible outcomes are 17

2  , 3  , 5  , 7  ,  11 ,  13  , 17   - are prime numbers

7 Prime numbers

favorable outcomes for a prime number = 7

Probability = 7/17

Composite numbers -  

a positive integer that has at least one divisor other than 1 and itself

4, 6, 8, 9, 10, 12, 14, 15, 16    -  Hence 9 Composite numbers

probability that a student with composite roll number will give the presentation = 9/17

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