Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is_____________?

Related Mcqs:

1. The probability that a number selected at random from the first 50 natural numbers is a composite number is__________?

   A. 21/25 B. 17/25 C. 4/25 D. 8/25...

2. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?

   A. 3/22 B. 4/21 C. 2/21 D. 1/14...

3. Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is_________?

   A. 10/17 B. 10/19 C. 46/105 D. Cannot be determined...

4. The sum of five numbers is 655. The average of the first two numbers is 85 and the third number is 125. Find the average of the two numbers?

   A. 180 B. 170 C. 190 D. 175...

5. The L.C.M of two numbers is 48. The numbers are in the ratio 2:3. The sum of numbers is__________?

   A. 28 B. 32 C. 40 D. 64...

6. The H.C.F and L.C.M of two numbers are 84 and 21 respectively. If the ratio of the two numbers is 1:4, then the larger of the two numbers is____________?

   A. 12 B. 48 C. 84 D. 108...

7. If the sum of two numbers is 55 and the H.C.F and L.C.M of these numbers are 5 and 120 respectively, then the sum of the reciprocal of the numbers is equal to___________?

   A. 55/601 B. 601/55 C. 11/120 D. 120/11...

8. The sum of the square of the three consecutive even natural numbers is 1460. Find the numbers?

   A. 18, 20, 22 B. 20, 22, 24 C. 22, 24, 26 D. 24, 26, 28...

9. Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is________?

   A. 75 B. 81 C. 85 D. 89...

10. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If four marbles are picked at random, what is the probability that none is blue?

    A. 17/91 B. 33/91 C. 51/91 D. 65/91...