From a set of 17 cards numbered 1, 2, 3 ....... 17 one is drawn at random. The probability that the number is divisible by 3 or 7 is?

2/17
1/7
7/17
10/ 17

Correct Answer: 7/17

Explanation:

Total number of cases is 17.
∵ Number divisible by 3 are 3, are 3, 6, 9, 12, 15 (These are 5 in number )
Number divisible by 7 are 7, 14. (These are 2 in number )
There are two favourable number of cases
Total no. of favourable number = 5 + 2
Required probability = 7/17.

More Questions from Probability

A card is drawn at random from a pack of 100 cards numbered 1 to 100. The probability drawing a number which is a square is?
In suffling a pack of card 3 are accidentally dropped then the chance that missing card should be of different suit is?
The probability that a card drawn from a pack of 52 cards will from a pack of 52 cards will be diamond or king being to?
There are four machine and it is know that exactly two of them are faulty, They are tested. One by one in a random order till both the faulty machines are identified. Then the probability that only two tests are needed is?
If E be the set of all integers with 1 in their unit place. The probability that a number chosen {2, 3, 4,...50} is an elements of E, is?
Three students are picked at random from a school having a total of 1000 students. The probability that these students will have identical date and month of their birth, is?
I forgot the last digit of a 7- digit telephone number. If I randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number?
What is the probability that a non-leap year contains 52 Tuesday only?
From a pack of 52 playing cards, two cards are drawn together at random. Calculate the probability of both the cards being king?
In a bag containing three balls, a white ball was placed and then one ball was taken out at random. What is the probability that the extracted ball would turn on to be white, if all possible hypothesis concerning the colour of the balls that initially in the bag were equally possible?

Discussion & Comments

No comments yet. Be the first to comment!