If a and b are two integers divisible by 5, which of the following is not necessarily true?

  • Option 1)

    ab is divisible by  5

  • Option 2)

    a2b2 is divisible by 25

  • Option 3)

    a + b is divisible by 10

  • Option 4)

    a^{2}+b^{2}  is divisible by 10

  • Option 5)

    none of these

Answers (1)

            Let a=5                        b=10

a+b=15 (not divisible by 10)

Not necessary to be true

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