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Observe that 2 xx 3+ 1 = 7 is a prime nu...

Observe that `2 xx 3+ 1 = 7` is a prime number. Here 1 has been added to a multiple of 2 to get a prime number. Can you find some other numbers of this type.

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Knowledge Check

  • The LCM of two co prime numbers is 143. If one nuimber is 11 then find the other number.

    A
    132
    B
    154
    C
    18
    D
    13
  • Probability of choosing a prime number from 1 to 9 is

    A
    `(4)/(9)`
    B
    `(5)/(9)`
    C
    1
    D
    None
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