$\begin{array} { c } 1 = 2 - 1 \\1 + 1 = 3 - 1 \\1 + 1 + 2 = 5 - 1\end{array}$

Q78: Use the formula indicated to determine

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Q81: <span class="ql-formula" data-value="\begin{array} { l } 2

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Q88: <span class="ql-formula" data-value="\begin{array} { l } 2