Ten different letters of alphabets are given. Words with five letters are formed from these given letters. Then, the number of words which have at least one repeated letter is :

How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated?

The number of ways in which the letters of the word “ALGEBRA” can be arranged so that two A's are not adjacent, are

How many 4-letter words with or without meaning, can be formed out of the letters of the word, 'LOGARITHMS', if repetition of letters is not allowed?

What is the sum of all four digit numbers formed by using all digits 0, 1, 4, 5 without repetition of digits ?

How many words can be formed from the letters of the word 'ENGINEER'?