If the coefficients of the equation whose roots are k times the roots of the equation , are integers, then a possible value of k is
3
12
9
4
The sum of all 4-digit numbers that can be formed using the digits 2, 3, 4, 5, 6 without repetition, is
533820
532280
533280
532380
If a set A has 5 elements, then the number of ways of selecting two subsets P and Q from A such that P and Q are mutually disjoint, is
64
128
243
729
If the middle term in the expansion of (1 + x)2n is the greatest term, then x lies in the interval
(n - 2, n)
(n - 1, n)
To find the coefficient of x4 in the expansion of , the interval in which the expansion is valid, is
C.