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52 → (13 x 4) : 91 → (13 x 7) 72 → (18 x 4) : 126 → (18 x 7)
How many five digit numbers can be formed using the digits 0, 1, 2, 3, 4 and 5 which are divisible by 5, without repeating the digits?
Find the quantity of methods of picking 4 cards from a set of 52 playing cards if four cards are of the same unit?
In how ways can the selection be made so that a particular member is always included?
How many words can be formed with the letter of the word ‘NUMBER’ when alll vowels are never together?