Let A and B be two sets containing four and two elements respectively. Then the number of subsets of the set A x B, each having at least three elements is:
219
256
275
275
A complex number z is said to be unimodular, if |z|= 1. suppose z1 and z2 are complex numbers such that is unimodular and z2 is not unimodular. Then, the point z1 lies on a
straight line parallel to X -axis
straight line parallel to Y -axis
circle of radius 2
circle of radius 2
6
-6
3
3
The number of integers greater than 6000 that can be formed, using the digits 3,5,6,7 and 8 without repetition, is
216
192
120
120
If m is the AMN of two distinct real numbers l and n (l,n>1) and G1, G2, and G3 are three geometric means between l and n, then equals
4l2 mn
4lm2n
4 lmn2
4 lmn2
The negation of is equivalent to
D.
If the angles of elevation of the top of a tower from three collinear points A, B and C on line leading to the foot of the tower are 30o, 45o and 60o respectively, then the ratio AB: BC is
The mean of the data set comprising of 16 observations is 16. If one of the observation value 16 is deleted and three new observations valued3,4 and 5 are added to the data, then the mean of the resultant data is
16.8
16.0
15.8
15.8