UPSC CDS 2 2020 Math Paper
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Question : 62 of 100
Marks:
+1,
-0
Let d(n) denote the number of positive divisors of a positive integer n.
Which of the following are correct?
1. d(5) = d(11)
2. d(5).d(11) = d(55)
3. d(5) + d(11) = d(55)
Select the correct answer using the code given below:
Which of the following are correct?
1. d(5) = d(11)
2. d(5).d(11) = d(55)
3. d(5) + d(11) = d(55)
Select the correct answer using the code given below:
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