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A Door Lock Is Opened by Pushing a Sequence of Buttons

Question 16

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A door lock is opened by pushing a sequence of buttons. Each of the three terms in the combination is entered by pushing either one button or two buttons simultaneously. If there are 5 buttons, how many different combinations are there? (Example: 1-3, 2, 2-4 is a valid combination.)

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A push of buttons in the combinations is...

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