The number `(log)_2 7` is (1990, 2M) (a) an integer (b) a rational number (c) an irrational number (d) a prime number

3. 27 is (a) an integer (b) a rational number (c) a natural number (d) an irrational number

If f(x)=cosx+cosa x is periodic function, then a must be (a)an integer (b) a rational number (c)an irrational number (d) an even number

All the rational numbers are irrational also.

(log)_4 18 is a rational number (b) an irrational number (c)a prime number (d) none of these

Insert a rational and an irrational number between 2 and 3.

Insert a rational number and an irrational number between 3 and 4.

Insert a rational number and an irrational number between 5 and 6.

tan 5^@ is (A) rational number (B) Irrational number (C) prime number (D) none of these

Every rational number is an integer.

The solution of the equation 7^(logx)-5^(logx+1)=3*5^(logx-1)-13*7 ^(logx-1)is (a) an even number (b) rational number (c) irrational number (d) composite number