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The average of all the prime and composi...

The average of all the prime and composite numbers upto 100 is :

A

51

B

`49.50`

C

`50.50`

D

55

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • In a set of prime and composite numbers, the composite number are twice the number of prime numbers and the average of the numbers of the set is 9. If the number of prime number and composite number are exchanged then the average of the set of numbers the average of the prime number and composite numbers individually remained constant then the raito of the average of coposite number to the average of prime numbers (initially) was :

    A
    7/13
    B
    13/7
    C
    9/11
    D
    none of these

  • In a set of prime and composite numbers, the composite numbers are twice the number of prime numbers and the average of all the number of the set is 9. If the number of prime numbers and composite numbers are exchanged then the average of the set of numbers is increased by 2. If during the exchange of the numbers the average of the prime numbers and composite numbers individually remained constant, then the ratio of the average of composite numbers to the average of prime numbers (initially) was :

    A
    a. `(7)/(13)`
    B
    b. `(13)/(7)`
    C
    c. `9//11`
    D
    d. none of these

  • The average of the first five odd prime numbers is

    A
    7
    B
    `7.8`
    C
    8
    D
    `8.7`

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    Question stimulus:- The average of all odd numbers up to 100 is:

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