81. 

Which one of the following numbers is completely divisible by 99?

A. 3572404
B.

135792

C.

913464

D.

114345


82. 

If a and b are odd numbers, then which of the following is even ?

A. a + b
B.

a + b + 1

C.

ab

D.

ab + 2


83. 

The sum all even natural numbers between 1 and 31 is:

A. 16
B.

128

C.

240

D.

512


84. 

The difference between the place value and the face value of 6 in the numeral 856973 is

A. 973
B.

6973

C.

5994

D.

None of these


85. 

Which one of the following is a prime number ?

A. 119
B.

187

C.

247

D.

551