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(16)
Select the correct answer using the code given below :
1 and 3 only
1 and 2 only
2 and 3 only
1, 2 and 3
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy