Fill in the blank space for the given series with the correct alternative.
$2, 9, 28, 65, 126, (\ldots)$

Fill in the blank space for the given series with the correct alternative.
In the series $2, 6, 18, 54, \ldots,$ what will be the $8^{th}$ term?

Choose the correct alternative to complete the series: $a . c . a b b . . a . b e . b e . . a b$

Fill in the blank space for the given series with the correct alternative.
$2, 3, 8, 63, (\ldots)$

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If $2$ is added to the sum of the digits of each of the above numbers,how many will be multiples of $5$?

Find the missing letters for the given series from the given alternatives:
$c....ac....aa....bc....bcc$