How many 4-letter code can be formed using the first 10 letters of the English alphabet, if no letter can be repeated?

How many 3 letter code combinations are possible using the first 10 letters of English alphbets if: i. no letter can be repeated, ii. letters can be repeated.

The capital letter S in the English alphabet has :

How many 5 letters words can be formed using the letters of the words ' INEFFECTIVE '

How many seven letters words can be formed by using the letters of the word SUCCESS so that

How many three letter words can be made using the letters of the word ORIENTAL?

How many four- letters words can be formed using the letters of the word 'INEFFECTIVE'?

How many different words can be formed with the letters of the word CLIFTON.

Which letters of the English alphabet have : no lines of symmetry

How many codes containing 3 letters can be formed with the 9 letters of English alphabet if repetition is not allowed?

How many different words can be formed by using all the letters of the word ALLAHABAD?