99. The sum of first 45 natural numbers is :

A.1035

B.1280

C.2070

D.2140

100. The sum of all even natural numbers between 1 and 31 is

A.16

B.128

C.240

D.512

101. (51 + 52 + 53 + ... + 100) = ?

A.2525

B.2975

C.3225

D.3775

102. How many natural numbers are there between 23 and 100 which are exactly divisible by 6 ?

A.8

B.11

C.12

D.13

103. The sum of all two digit numbers divisible by 5 is

A.1035

B.1245

C.1230

D.945

104. The sum of how many terms of the series 6 + 12 + 18 + 24 + ??. is 1800 ?

A.16

B.24

C.20

D.18

105. How many terms are there in the G.P. 3, 6, 12, 24,...., 384 ?

A.8

B.9

C.10

D.11

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