Progression and Series

In the question a letter-series is given, in which some letters are missing. The missing letters are given in the proper sequence as one of the alternatives. Find the correct alternative.
ba_abab_b_ba_aba.

Look at this series: $31, 29, 24, 22, 17, ...$ What number should come next_____?

In the following question, a number of series is given. After the series, a number is given followed by $A$, $B$, $C$, $D$ and $E$. You have to complete the series starting with the number given, following the sequence of the given series,

$200, 184, 193, 157, 182, 118, 167$

$150, A, B, C, D, E, F$

Which of the following numbers will come in place of $E$?

In the following number series, one number is wrong. Find out the odd number:

$7, 9, 17, 42, 91, 172, 293$

In the following question, one term in the number series is incorrect.

Find out the incorrect number in the given series: $5, 10, 17, 24, 37$

In the following question, one term in the number series is incorrect.

Find out the incorrect number in the given series:  $121, 143, 165, 186, 209$

Look at this series:$11, 16, 21, 26, 31, 36, 41$

What number should come next?

Look at this series: $8, 43, 11, 41, \_\_, 39, 17$

What number should come next?

Look at this series: $2, 1, \frac{1}{2}, \frac{1}{4}, ....$

What number should come next?

In following question, a number of series is given with one term missing. Choose the correct alternative that will follow the same pattern and find the unknown $1,2,3,6,9,18,?,54$.

Complete the Given Series
Which is the number that comes next in the following sequence?
$4, 6, 12, 14, 28, 30, ?$

Find the sum of the following series:

$\left({11}^2+{12}^2+{13}^2+.........+{20}^2\right)=?$

Look at this series: $3,4,7,8,11,12,...$. What number should come next?

Find the odd word/ letters/ number/figure pair from the given alternatives.

Look at this series: $11, 16, 21, 26, 31, 36, 41, ?, ?$

What number should come next?

In the following number series how many $9$’s are there which are preceded by $3$ and followed by $6$ ?
$39693939396363956956939639$

$120, 99, 80, 63, 48, ?$

The next no. is _____.

In the following question, one term in the number series is incorrect.

Find out the incorrect number in the given series: $125, 126, 124, 127, 123, 129$

In the following number series, one number is wrong. Find out the wrong number:

Find the sum of first $9$ even natural numbers:

$2+4+6+8+10+12+14+16+18$