How many such pairs of digits are there in the number

12, 13, 27, 82, 329, ?

58, 63, 78, ?, 138, 183

3, 5, 12, 38, 154, ?

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

1458, ?, 162, 54, 18, 6

What will come in the place of questions (?) mark in the following questions.

40, 25, 30, 50, 105, ?

11       16       42       141       ?      2945      17700

43           86           258         ?              5160                       30960

Find the missing number in the given number series.

4, ?, 110, 665, 4660, 37285

7, 9, 21, ?, 107, 197

58      83      133      ?       308       433