find the number of ways in which 11 indentical apples can be distributed among 6 children so that each child receives atleast one apple.

 

ans: 252

 

2) how many + ve integrel soln are there for eqn x+y+z+w = 20

ans: 19 c3

1) the no of ways of distributing 8 identical balls in 3 distinct boxes so that none is empty

 

2) sum of series 1/2! + 1/4!  + 1/6!.....is

 

if lim x - infinity (1+ a/x  + b/x^2  ) ^2x = e^2 values of a and b

 

3) let a , b, c be 3 non collinear vectors such that no 2 of these are collinear . if vector a + 2b is collinear with c and b+2c is collinear with a

 

then a + 2b + 6c = ????

 

ans: 0