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From 25 Identical Cards, Numbered 1, 2, 3, 4, 5, ……, 24, 25: One Card is Drawn at Random. Find the Probability that the Number on the Card Drawn is a Multiple Of: 3 - ICSE Class 10 - Mathematics

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Question

From 25 identical cards, numbered 1, 2, 3, 4, 5, ……, 24, 25: one card is drawn at random. Find the probability that the number on the card drawn is a multiple of: 

3

Solution

There are 25 cared from which one card is drawn. 

Total number of elementary event=n(s)=25 

From numbers 1 to 25, there are 8 numbers which are multiple of i.e [3,6,9,12,15,18,21,24] Favorable number of event =n(E)=8 

Probability of selecting a card with a multiple of 3= 

`(n(E))/(n(s))=8/25` 

 

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Solution From 25 Identical Cards, Numbered 1, 2, 3, 4, 5, ……, 24, 25: One Card is Drawn at Random. Find the Probability that the Number on the Card Drawn is a Multiple Of: 3 Concept: Type of Event - Complementry.
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