In how many different ways can the letters of the word '$BANKING$' be arranged?

How many lines can be drawn through $21$ points on a circle?

The number of words (with or without meaning) that can be formed from all the letters of the word "$LETTER$" in which vowels never come together is

How many numbers of $6$ digits can be formed from the digits of the number $112233$?

We are to form different words with the letters of the word $INTEGER$. Let $m_1$ be the number of words in which $I$ and $N$ are never together and $m_2$ be the number of words which begin with $I$ and end with $R$,then $m_1/m_2$ is equal to

The number of ways in which an examiner can assign $30$ marks to $8$ questions,giving not less than $2$ marks to any question,is