Alock has 5 buttons. the lock is opened by pushing two buttons simultaneously and then by pushing one button alone. how many combinations are possible?

We first must calculate how many ways 2 oblects can be chosen from 5.

combinations = 5! / 2! * (5-2)!

combinations = 5*4 / 2

combinations = 10

There are 10 ways to choose the 2 buttons and 5 ways to choose the final butto so there are 10 * 5 = 50 different ways.

Source

1728.com/combinat.htm

1; 35 is the ratio

step-by-step explanation:

your answer is the frist one

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