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The number of ordered pairs (m, n), m, such that 6n + 9m is a multiple of 5 is
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a
6250
b
1250
c
1875
d
None of these
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Correct option is B
All the numbers of the form 6n will end with 6 and 9m will end with 9, if m is odd and will end with 1, if m is even. Therefore, 6n + 9m will end with 5 if n is any number and m is odd.Thus, number of ordered pairs = 50 × 25 = 1250.Similar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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