The number of permutations by taking all letters and keeping the vowels of the word COMBINE in the odd places is
96
144
512
576
Product of any r consecutive natural numbers is always divisible by
r!
(r + 4)!
(r + 1)!
(r + 2)!
Out of 8 given points, 3 are collinear. How many different straight lines can be drawn by joining any two points from those 8 points ?
26
28
27
25
A.
26
Required number of straight lines,
How many odd numbers of six significant digits can be formed with the digits 0, 1, 2, 5, 6, 7 when no digit is repeated ?
120
96
360
288
The number of ways four boys can be seated around a round-table in four chairs of different colours is
24
12
23
64
20 persons are invited for a party. In how many different ways can they and the host be seated at circular table, if the two particular persons are to be seated on either side of the host?
20!
2(18!)
18!
None of these
There are 5 letters and 5 different envelopes. The number of ways in which all the letters can be put in wrong envelope, is
119
44
59
40