State whether each of the following sets is finite or infinite.
(iv) The set of animals living on the earth.
The number of animals living on the earth, though very large, are finite.
Hence, the set of animals living on the earth is a finite set.
Collection of all divisors of 42.
Collection of beautiful girls in India.
Fill in the blanks in the following table:
Numbers 
Closed under 

Addition 
Subtraction 
Multiplication 
Division 

Rational numbers 
Yes 
Yes 
No 

Integers 
Yes 
No 

Whole numbers 
... 
Yes 

Natural numbers 
No 

Express each of the complex number given in the Excercise 1 to 10 in the form a + ib.
i^{9 }+ i^{19 }
i^{39 }
3(7 + i7) + i(7 + i7)
Express each of the complex number given in the form of a + ib.
(1  i)  (1 + i6)
Express each of the complex number given in the form of a + ib.
Express each of the complex number given in the form of a + ib.