In the expansion of (1 + x)43, if the coefficients of (2r + 1)th and (r + 2)th terms are equal, then what is the value of r (r 1) ?
5
14
21
22
Let be real numbers and z be a complex number. If has two distinct non-real roots with Re(z) = 1, then it is necessary that :
C.
We can solve this through Venn diagram
How many numbers between 100 and 1000 can beformed with the digits 5, 6, 7, 8, 9, if the repetition of digits is not allowed ?
35
53
120
60
If the ratio of AM to GM of two positive numbers a and b is 5 : 3, then a : b is equal to :
3 : 5
2 : 9
9 : 1
5 : 3
If the coefficients of am and an in the expansion of (1+ a)m + n are , then which one of the following is correct ?