Straight Lines ...

$$16,40,100,250 , ?$$

In the given figure (not drawn to scale), the coordinates of P, Q and R are (3, 0) (0, 5) and (0, -5) respectively. Find the area of $$\Delta PQR$$.

Find the missing number

Find : $$13,23,43,83,163 , ?$$

The number of seven letter words that can be formed by using the letters of the word  $$SUCCESS$$  that the two  $$C$$ are together but no two  $$S$$  are together is

Find the missing number :

The value of $$^{47}C_{4}+\displaystyle \sum _{ j=1 }^{ 5 }\ ^{ \left( 52-j \right)  } { C }_{ 3 }$$ is

$$496 : 204 : : 329 : ?$$

Find the missing number.

A committee of $$4$$ persons is to be formed from $$2$$ ladies, $$2$$ old men and $$4$$ young men such that it includes at least $$1$$ lady. at least $$1$$ old man and at most $$2$$ young men. Then the total number of ways in which this committee can be formed is :