Which number will replace the question mark in the series?

$7,12,19,?,39$

Which number will replace the question mark in the series ?

$20,19,17,?,10,5$

Which number will replace the question mark in the series?

$4,10,?,82,244,730$

Which number will replace the question mark in the series

$5, 16, 49, 104, ?$

Which number will replace the question mark in the series?

$840, 168, 42, 14, 7, ?$

Which number will replace the question mark in the series?

$13, 32, 24, 43, 35, ?, 46, 65, 57, 76$

Which number will replace the question mark in the series ?

$6, 11, 21, 36, 56, ?$

Which number will replace the question mark in the series?

$12, 32, 72, 152, ?$

Which number will replace the question mark in the series?

$5, 6, 9, 15, ?, 40$