Digital circuits can be made by repititive use of ………………..gate. (AND ,NAND)

How many NAND gates are used to form AND gate?

Find the number of words with or with out meaning, which can be made by using all the letters of the word ‘GANGA’.

How many words, with or without meaning that can be made from the letters of the word ‘MONDAY’, assuming that no letter is repeated if all letters are used at a time.

How many words, with or without meaning that can be made from the letters of the word ‘MONDAY’, assuming that no letter is repeated if 4 letters are used at a time.

How many words, with or without meaning that can be made from the letters of the word ‘MONDAY’, assuming that no letter is repeated if all letters are used but first letter is a vowel?