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Ever thought of finding simple ways to answer equally simple questions?
Ever thought how many outcomes can come of a simple toss of a coin?
Or
How many probable numbers may show up in a single throw of an unbiased dice?
Or
How many possible outcomes are there of a single draw of a card of “Ace” from a pack of cards?
Or
In how many ways can one put 6 letters in 3 letter boxes?
Or
In how many ways can 5 persons sit in a row?
Or
In how many ways can 5 persons sit on 3 available seats?
If not, it is time you started thinking simply using your common sense without contemplating a possible recourse to complicated permutation or combination formulae.
Yes, a coin can have either a Heads or a Tail, hence, 2 ways.
For another coin, possible outcomes would be 2 X 2 = 4 ways and so on.
A dice can throw up any number from 1 to 6 in one toss, hence, 6 ways.
Another dice can do the same in another 6 ways.