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SBI PO MAINS (NUMBER SYSTEM )
  • 2016-07-22
SBI PO MAINS (NUMBER SYSTEM )

1.0.393939…… is equal to

1)  39/100            2)  13/33     

3)  93/100            4)39/990      

2.when simplified the product

(1-1/3 )(1-1/4 )(11/5- )…….(1-1/n ) becomes

1)  1/n                         2)2/n    

3)   2(n-1)/n                4)2/n(n+1)              

3.If the difference of two numbers is 3 and the difference of their squares is 39; then the larger number is :

1)9            2)12

3)13            4)8

4.sum of two numbers is 40 and their product is 375.what will be the sum of their reciprocals?

1)  8/75       2)  1/5     3)  75/8    4)75/4     

5. If the sum of two numbers is 3 and the sum of their squares is 12,then their product is equal to

1)  3/2    2)2/3    3)-3/2    4)-2/3 

6.In a test, 1 mark is awarded for each correct answer and one mark is deducted for each wrong items of the test and gets 8 marks, the number of questions answered correct by him was

1)16           2)14           3)12           4)8

7. The difference between two positive numbers is 3. If the sum of their squares is 369, then the sum of the numbers is:

1)81           2)33            3)27            4)25

8.The last digit of 340 is

1)1    2)3    3)7    4)9

9. There are 50 boxes and 50 persons.person 1 keeps 1 marble in every box.Person 2 keeps 2 marbles in every 2nd box,person 3 keeps 3 marbles in every third box.This process goes on till person 50 keeps 50 marbles in the 50th box.Find the total number of marbles kept in the 50th box.

1)43           2)78           3)6             4)93

10. If a*b=a+b+a/b  , then the value of 12*4 is :

1)20         2)21        3)48         4)19

 

Answer:

1-2              2-2              3-4               4-1             5-3                

6-2              7-3              8-1             9-4                 10-4

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