Let \( A=\{1,3,5,7,9\} \) and \( B=\{2,4,6,8\} \). An element \( (a, b) \) of their cartesian pr....

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Let \( A=\{1,3,5,7,9\} \) and \( B=\{2,4,6,8\} \). An
\( \mathrm{P} \)
element \( (a, b) \) of their cartesian product \( A \times B \) is
W
chosen at random. The probability that \( a+b=9 \), is
(1) \( 1 / 5 \)
(2) \( 2 / 5 \)
(3) \( 3 / 5 \)
(4) \( 4 / 5 \)


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