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प्रश्न
Two numbers 'a' and 'b'are selected, successively without replacement in that order, from integers 1 to 10. The probability that a/b is an integer, is ______.
रिक्त स्थान भरें
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उत्तर
Two numbers 'a' and 'b'are selected, successively without replacement in that order, from integers 1 to 10. The probability that a/b is an integer, is `underlinebb(17/90)`.
Explanation:
There are \[10\times9=90\] ordered pairs. There are 17 pairs with distinct entries for which b divides a.
Therefore, the probability is \[\frac{17}{90}\].
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