HCU MCA 2014 Paper

Question : 9 of 75

Marks: +1, -0

How many ordered pairs of integers (a, b) are needed to guarantee that there are two ordered pairs

(\a_{1},\b_{1}) \;\and \;(\a_{2},\b_{2})

such that

\a_{1}

mod 5 =

\a_{2}

mod 5 and

\b_{1}

mod 5 =

\b_{2}

mod 5 ?

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