What will come in place of the question mark $(?)$ in the following number series?
$100, 81, 64, 49, ?$

In the following number series,one of the numbers does not fit into the series. Mark the wrong number in the series.
$10 \quad 12 \quad 28 \quad 90 \quad 368 \quad 1840 \quad 1112$

$13, 21, 29, 34, 43, 92, 12, ?$

Find the missing number in the series: $2, 6, 14, 30, ?, 126, 254$.

$45, 46, 70, 141, ?, 1061.5$

$3, 7, 15, ?, 63, 127$