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Donuts come in 30 different varieties and Catherine wants to buy a dozen . How many choices does she have? Explain this please.
in Combinatory by (8 points) | 6 views
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with repetitive :-

first one  --- 30 varieties

second one -- 30 varieties

...

12th one --- 30 varieties

Ans = (30)$^{12}$


without repetitive :-

first one -- 30  varieties

second one -- 29  varieties

...

12th one  --- (30-11)  varieties

Ans = 30.29.....19

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