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
B.
14
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 :
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 ?