A Door Lock Is Opened by Pushing a Sequence of Buttons

question 16

Essay

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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Definitions:

Distributions of Organisms

The geographical and ecological patterns in which species and populations are spread across different habitats and regions.

Amino Acid Sequences

The order of amino acids in a polypeptide or protein, which determines the protein's structure and function.

Nucleotide Sequences

The precise order of nucleotides (adenine, thymine, cytosine, and guanine) within a DNA or RNA molecule, which encodes genetic information.

Evolutionary Relationships

Connections among species or groups based on common ancestry and genetic heritage, often illustrated by evolutionary trees.