Permutations an...

Find the missing number from the given alternatives.

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 $$\Delta PQR$$.

$$8, 31, 122, 485, 1936, 7739, ?$$

$$499, 622, 868, 1237, 1729, 2344, ?$$

Six people are going to sit in a row on a bench. $$A$$ and $$B$$ are adjacent, $$C$$ does not want to sit adjacent to $$D.E$$ and $$F$$ can sit anywhere. Number of ways in which these six people can be seated is 

Find : $$12,15,21,24,30,33 , ? , ?$$

Find the missing number :

$$23,29,47,75 , ?$$

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

Find the missing number