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If m = number of distinct rational numbers such that and n = number of mappings from {1, 2, 3} onto {1, 2}, then m – n is
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a
1
b
-1
c
0
d
3
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Correct option is D
Now, n=23−2=6Also, m=4+3+2+1−1=9 as 24=12∴ m−n=3Similar Questions
The number of integral solutions of is
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