If out of $20$ consecutive whole numbers two are chosen at random, then the probability that their sum is odd, is
If out of $20$ consecutive whole numbers two are chosen at random, then the probability that their sum is odd, is
- A
$\frac{5}{{19}}$
- B
$\frac{{10}}{{19}}$
- C
$\frac{9}{{19}}$
- D
None of these
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