Number Padlocks

A padlock with 8 numbers and you only can choose 4 numbers out of the 8. Order does not matters! How many ways are there to choose the numbers


The answer is 70.

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2 solutions

Kislay Raj
Mar 5, 2015

please add the line," How many ways are there to choose the numbers" in the problem..

Joel Yip
Mar 5, 2015

Take 8C4 to make 70.

This is a wrong answer : the answer should be 8p4 not 8 c4 ..

Ossama Ismail - 6 years, 3 months ago

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Let say corder matters for now, ill change the question

Joel Yip - 6 years, 3 months ago

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