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Q61. A positive integer is selected at random and is divided by 7,what is the probability that the remainder is 1?
A. 3/7
B. 4/7
C. 1/7
D. 2/7
Ans. C
Q62. In how many ways can the 7 letters A,B,C,D,E,F and G be arranged so that C and E never together.
A. 5040
B. 6480
C. 3600
D. 1440
Ans. C
Q63. There are four prime numbers written in ascending order of magnitude. The product of first three is 385 and that of last three is 1001. Find the first number.
A. 5
B. 7
C. 11
D. 17
Ans. A
Q64. M and N are two distinct natural numbers. HCF and LCM of M and N are K and L respectively. A is also a natural number, which of the following relations is not possible?
A. KL=A
B. L*A=K
D. None of these
Ans. B
Q65. A mixture of 40 litres of salt and water contains 70% of salt.how much water must be added to decrease the salt percentage to 40%?
A. 40 litres
B. 30 litres
C. 20 litres
D.2 litres
Ans. B