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Quantitative | Re: PERMUTATIONS and COMBINATIONS Simplified

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gmatmba12 wrote:

I have a question. If a question says how many ways can you select one head from 5 flips of the coin, its obvious the answer is 5 as shown below. How can I calculate this without drawing it out (in case the problem was more difficult)? Is it[5!/??] . What would denominator/??be?

HTTTT
THTTT
TTHTT
TTTHT
TTTTH



Say if you had to find the number of ways of getting exactly 2 Heads and 3 tails, what would you do?

HHTTT
HTHTT
... etc

Basically you are arranging 2 Hs and 3 Ts in as many
...

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