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rank of a word in dictionary

Rank of a word in dictionary:- If ‘ABC’ is arranged in dictionary order. find the rank of the word ‘CAB’ ABC → 1ˢᵗ ACB →2ⁿᵈ BAC → 3ʳᵈ BCA → 4ᵗʰ CAB → 5ᵗʰ → Answer CBA → 6ᵗʰ (Q). Find the rank of the word MOTHER when its letters are arranged in...

formation of word

                                        Word/Number Formation Formation of word:- The number of arrangement of n things taken all at a time when p of them are identical of one type, q of them are identical of another type, r of them are identical of another type &...