[" 4- 16.Eight cards bearing number 1,2,3,4,5,6,7,8are well shurfled.Then in how many cases the top "],[" Eacards will form a pair of twine equals "],[[" (A) "720," (B) "1440," (C) "2880," (D) "2160]]

Eight cards bearing number 1,2,3,4,5,6,7,8 are well shuffled.Then in how many cases the top 2 cards will form a pair of twin prime equals

Let A={1,2,3,4,5,6,7,8,9). How many subsets does A have which contain 4,5 and 6?

From the set {2, 3, 4, 5, 6, 7, 8, 9} , how many pairs of co-primes can be formed?

From the set {2,3,4,5,6,7,8,9}, how many pairs of co-primes can be formed?

8 cards are numbered as 1,2,3,4,5,6,7,8 respectively. They are kept in a box and mixed thoroughly. One card is chosen at random. What is the probability of getting a number less than 4?

Box 1 contains three cards bearing numbers 1, 2,3, box 2 contains five cards bearing numbers 1,2,3,4,5, and box 3 contains seven card bearing numbers 1,2,3,4,5,6,7. Acard is drawn from each of the boxes. Let, x_(i) be the number on the card drawn from the i^(th) box i = 1,2,3. The probability that x_(1) + x_(2), + x_(3) is odd,is-

Box 1 contains three cards bearing numbers 1, 2,3, box 2 contains five cards bearing numbers 1,2,3,4,5, and box 3 contains seven card bearing numbers 1,2,3,4,5,6,7. Acard is drawn from each of the boxes. Let, x_(i) be the number on the card drawn from the i^(th) box i = 1,2,3. The probability that x_(1), x_(2), x_(3) are in an arithmetic progression, is-

Box 1 contains three cards bearing numbers 1, 2, 3; box 2 contains five cards bearing numbers 1, 2, 3,4, 5; and box 3 contains seven cards bearing numbers 1, 2, 3, 4, 5, 6, 7. A card is drawn from each of the boxes. Let x_i be the number on the card drawn from the ith box, i = 1, 2, 3. The probability that x_1+x_2+x_3 is odd is

Box 1 contains three cards bearing numbers 1, 2, 3; box 2 contains five cards bearing numbers 1, 2, 3,4, 5; and box 3 contains seven cards bearing numbers 1, 2, 3, 4, 5, 6, 7. A card is drawn from each of the boxes. Let x_i be the number on the card drawn from the ith box, i = 1, 2, 3. The probability that x_1, x_2, x_3 are in an aritmetic progression is