Select the pair that has the same analogy as given pair $9876:12234567$.

Which of the following pair is different?
$(16,18) ;(56,63) ;(96,108) ;(86,99)$

What comes in the place of the blanks?

$\mathrm{XXIV},\mathrm{XXII},\mathrm{XXV},\mathrm{XXIII},\mathrm{XXVI},\mathrm{\_\_\_\_},\mathrm{\_\_\_\_}, \mathrm{XXV}$

The following number series follows a particular pattern. One of the numbers in the given series is wrong. Identify that wrong number:

$3 15 63 129 1023 4095$

Find the missing number $\left(?\right)$ in the series:

$4, 55, 576, ?, 21280, 64083, 64204$

A newspaper has $6$ sheets consisting of $24$ pages in total. If page number $17$ of that newspaper is missing then find the set of missing pages in that newspaper, from the alternatives given below:

Complete the following series:

$6,24,60, ?, 210$