Straight Lines ...

Find the missing number, if same rule is followed in all the three figures.

The number of the three digits numbers having only two consecutive digits identical is:

Find the missing number in the given figure?

A student is to answer 10 out of 13 questions in an examination such that he must choose at least 4 from the first five questions. The number of choices available to him is 

If $$\displaystyle\sum^m_{k=1}(k^2+1)k!=1999(2000!)$$, then m is?

In the following number series,one number is wrong.find out the ?

1,2,8,33,149,765,4626

If $$ '-'$$ denotes $$'\div ',\ '\div '$$ denotes $$'\times ',\ '+'$$ denotes' - 'and $$'\times '$$ denotes $$'+'$$, then find the value of $$116+9\div 52-4\times 5$$.

If $$n\ \in\ N$$ & $$n$$ is even, then $$\dfrac {1}{1\ .\ (n-1)\ !}+\dfrac {1}{3\ !(n-3)\ !}+\dfrac {1}{5\ !\  (n-5)\ !}+....+\dfrac {1}{(n-1)\ !\ 1\ !}=$$ 

$$435, 354, 282, 219, 165, ?$$

$$10$$ IIT and $$2$$ NIT students sit at random in a row, and then number of ways in which exactly $$3$$ IIT students sit between $$2$$ NIT students is