Explanation:
It's placed near the door. When a visitor presses the button, the bell rings inside alerting you that someone is at the door.
Answer:
<h3>Rules for Naming Variables</h3><h3>The first character must be a letter or an underscore (_). You can't use a number as the first character. The rest of the variable name can include any letter, any number, or the underscore. You can't use any other characters, including spaces, symbols, and punctuation marks.</h3>
<em><u>#</u></em><em><u>M</u></em><em><u>a</u></em><em><u>r</u></em><em><u>k</u></em><em><u>a</u></em><em><u>s</u></em><em><u>b</u></em><em><u>r</u></em><em><u>a</u></em><em><u>i</u></em><em><u>n</u></em><em><u>l</u></em><em><u>e</u></em><em><u>s</u></em><em><u>s</u></em><em><u>p</u></em><em><u>l</u></em><em><u>e</u></em><em><u>a</u></em><em><u>s</u></em><em><u>e</u></em><em><u>✅</u></em>
Answer:
left child = 2 index +1 & right child = 2 index + 2
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