Four numbers are multiplied together. Then the probability that the product will be divisible by 5 or 10 is a.`369//625` b. `399//625` c. `123//625` d. none of these

If n integers taken at random are multiplied together , then the probability that the last digit of the product is 1, 3, 7, or 9 is a. 2^n//5^n b. 4^n-2^n//5^n c. 4^n//5^n d. none of these

If any four numbers are slected and they are multiplied, then the probability that the last digit will be 1,3,5 or 7 is

A four figure number is formed of the figures 1, 2, 3, 5 with no repetitions. The probability that the number is divisible by 5 is a. 3//4 b. 1//4 c. 1//8 d. none of these

If four whole numbers taken art random are multiplied together, then find the probability that the last digit in the product is 1,3,7, or 9.

Two players toss 4 coins each. The probability that they both obtain the same number of heads is a. 5//256 b. 1//16 c. 35//128 d. none of these

The sum of two positive quantities is equal to 2ndot the probability that their product is not less than 3/4 times their greatest product is 3//4 b. 1//4 c. 1//2 d. none of these

Five different marbles are placed in 5 different boxes randomly. Then the probability that exactly two boxes remain empty is (each box can hold any number of marbles) 2//5 b. 12//25 c. 3//5 d. none of these

The numbers (a ,b ,c) are selected by throwing a dice thrice, then the probability that (a ,b ,c) are in A.P. is a. 1//12 b. 1//6 c. 1//4 d. none of these

Dialling a telephone number an old man forgets the last two digits remembering only that these are different dialled at random. The probability that the number is dialled correctly is 1//45 b. 1//90 c. 1//100 d. none of these