What is the name of the logic circuit which can add two

612, 487,?, 396, 388, 387

Find the missing number in the given number series.

1, 2, 6, 24, 120, ?

What will come in place of the question mark (?) in the following series?

36, 85, ?,  230, 330, 451

Find the missing term in the series:

2, 5, 11, 23, 47, ?

What will come in place of the question mark (?) in the following series?

400, 841, 1202, ?, 1716, 1885

44      45       41      50       ?       59       23

221, 100, 0, -81, ?

900     90      18      ?      2.16       1.08

16, 20, 11, 27, ?, 38

37, 57, 82, ?,  147, 187