EXERCISE MARK AGAINST THE CORRECT ANSWER IN EACH OF THE FOLLOWING: IN 131 TO 140:

130.(51 + 52 + 53 + ….   +100) =?

a)      2525

b)      2975

c)       3225

d)      3775

131.(1 – 1/n) + ( 1 – 2/n) + (1 – 3/n) + …. Up to n terms =?

a)      1/2n

b)      ½ (n-1)

c)       ½ n(n-1)

d)      None of these

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

a)      8

b)      11

c)       12

d)      13

e)      None of these

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

a)      1035

b)      1245

c)        1230

d)      945

e)      None o f these

134.The sum of how many terms of the series s 6+ 12 +18 +  24 …. Is 1800?

a)      16

b)      24

c)       20

d)      18

e)      2

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

a)      8

b)      9

c)       10

d)      11

e)      7

136.2 +2 ²+ 2³ + ….2⁹ =?

a)      2044

b)      1022

c)       1056

d)      None of these

137.(1² + 2² + 3² + ….+ 10²) =?

a)      330

b)      345

c)       365

d)      385

138.(2²+ 4²+ 6²+ ….+ 20²)=?

a)      770

b)      1155

c)       1540

d)      385 x 385

139.(11² +12² + 13²+ …..+ 20²) =?

a)      385

b)      2485

c)       2870

d)      3255

                       ANSWERS

131.(D)

132.(B)

 133.(D)

 134.(D) 

135.(B) 

136.(A) 

137.(B) 

138.(D) 

139.(C) 

140.(B).