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OpenStudy (anonymous):
Find the number of permutations of the first 10 letters of the alphabet taking 2 letters at a time. 90 120 160 45 I don't understand this
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ganeshie8 (ganeshie8):
How many two letter strings(words) can you make using 10 different letters ?
OpenStudy (anonymous):
uhh.
OpenStudy (anonymous):
like 10p2?
ganeshie8 (ganeshie8):
Exactly !
ganeshie8 (ganeshie8):
|dw:1405044729328:dw|
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ganeshie8 (ganeshie8):
we can choose any one of the 10 letters for first space : 10 ways
ganeshie8 (ganeshie8):
|dw:1405044782271:dw|
OpenStudy (anonymous):
okay hold on
ganeshie8 (ganeshie8):
after that, we can choose any one of the remaining 9 letters for the second space : 9 ways
ganeshie8 (ganeshie8):
|dw:1405044826551:dw|
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