Questions
The number of two digit numbers which are of the form xy with y < x are given by
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a
45
b
55
c
17
d
None of these
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Correct option is A
When zero is in the place of y then there are nine numbers and when 1 is in the place of y then there are 8 numbers and so on. Hence, required number is ∑n=19 n=45.Similar Questions
If then equal to
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