A letter of English alphabet is chosen at random. The probability that it is a letter of the word ‘RANDOM’ is :
A bag contains 40 balls out of which some are red, some are blue and remaining are black. If the probability of drawing a red ball is \(\dfrac{11}{20}\) and that of blue ball is \(\dfrac15\) , then the number of black balls is :
A digit is chosen at random from the digits 1 to 9. The probability that the digit is even is :
If a card is drawn from a pack of cards. The probability of getting black ace is :
A number x is chosen at random from the numbers – 3, – 2, – 1, 0, 1, 2, 3. The probability that |x| < 2 is :
A school has five houses A, B, C, D and E. A class has 23 students, 4 from house A, 8 from house B, 5 from house C, 2 from house D and rest from house E. A single student is selected at random to be the class monitor. The probability that the selected student is not from A, B and C is :
A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6,000 tickets are sold, how many tickets has she bought ?
Some one is asked to choose a number from 1 to 100. The probability of its being a prime number is :
In a single throw of a pair of dice, the probability of getting the sum a perfect square is :
A card is drawn from a deck of 52 cards. The event E is that card is not an ace of hearts. The number of outcomes favourable to E is :
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