2. Questions Bank
  3. 5th Class
  4. Mathematics
  5. Factors and Multiples

5th Class Mathematics Factors and Multiples Question Bank Factors and Multiples

  • question_answer
    Observe the twin primes in the table.
    (3, 5) (5, 7) (11, 13) (17, 19)
    P Q R S
    Which of the given twin primes are present in the prime factorisation of\[2145\]?

    A)  \[Q\]and\[R\]                

    B)                     \[P\]and\[S\]                 

    C)                     \[P\]and\[Q\]                

    D)                     \[P\]and\[R\]                 

    Correct Answer: D

    Solution :

    \[3\] \[2145\]
    \[5\] \[715\]
    \[11\] \[143\]
    \[13\]
    \[\therefore \]\[2145=3\times 5\times 11\times 13\] \[(3,\,\,5);\,\,(11,\,\,13)\] are the twin primes, i.e., \[P\] and \[R\] are the required twin primes.


You need to login to perform this action.
You will be redirected in 3 sec spinner