The number of zeros at the end of 2007! is

A  room  has  6  doors. The no. of  ways,  in  which a  man can enter  the room through  one door  and come  out  through  a different  door,  is

How many  ways are there to arrange the letters in the word 'GARDEN' with vowels in alphabetical order?

A shelf contains 6 separate compartments.The number of ways can 12 identical marbles be placed in the

compartments so that no compartment is empty, is

How many numbers can be formed with digits 1,2,3,4,3,2,1 .So that odd digits always occupy the odd places?

The no.  of  ways in  which  a  committee  of 5  members  can be  selected  from 6  men and 5 women consisting  of  3  men and  2 women is

How many  three -letter  words can  be   formed   from the  alphabets a, b, c, d  and  e,  if  repetition  is not allowed?

The number of positive integer solution (x,y,z) of the equation x y z = 24 is

In a cricket match between two teams X and Y, the team X requires 10 runs to win in the last 3 balls. If the possible runs that can be made from a ball be 0,1,2,3,4,5,6 the number of sequence of runs made by the batsman is

Let Tn  denote  the number of triangles which  can be formed using the  vertices  of a  regular  polygon of  n  sides.  If  T_(n+1) -T_n =  21 ,  then the   value  of n is