85. The difference of the squares of two consecutive odd integers is divisible by which of the following integers ?

A.3

B.6

C.7

D.8

86. n is a whole number which when divided by 4 gives 3 as remainder. What will be the remainder when 2n is divided by 4 ?

A.3

B.2

C.1

D.0

87. A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4-digit number 13b7, which is divisible by 11. Then, (a + b) =?

A.10

B.11

C.12

D.15

88. If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11 ?

A.4x + 6y

B.x + y + 4

C.9x + 4y

D.4x - 9y

89. If the number 653 xy is divisible by 90, then (x + y) =?

A.2

B.3

C.4

D.6

90. Which of the following numbers is divisible by each one of 3, 7, 9 and 11 ?

A.639

B.2079

C.3791

D.37911

91. A number when divided by 6 leaves a remainder 3. When the square of the number is divided by 6, the remainder is:

A.0

B.1

C.2

D.3

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