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MATH / The first six rows of Pascal's triangle are shown below, beginning with row 0.

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

The first six rows of Pascal's triangle are shown below, beginning with row 0. How many of the first 100 rows contain at least one even entry and no odd entries other than 11? (Rows 2 and 4 have this property, for example.) \begin{tabular}{ccccccccccc} &&&&&1&&&&&\\ &&&&1&&1&&&&\\ &&&1&&2&&1&&&\\ &&1&&3&&3&&1&&\\ &1&&4&&6&&4&&1&\\ 1&&5&&10&&10&&5&&1\\ \end{tabular}
Plain-text mathematical notation (without MathML)
The first six rows of Pascal's triangle are shown below, beginning with row 0.

How many of the first 100 rows contain at least one even entry and no odd entries other than 1? (Rows 2 and 4 have this property, for example.)

\begin{tabular}{ccccccccccc}
&&&&&1&&&&&\\
&&&&1&&1&&&&\\
&&&1&&2&&1&&&\\
&&1&&3&&3&&1&&\\
&1&&4&&6&&4&&1&\\
1&&5&&10&&10&&5&&1\\
\end{tabular}
Original LaTeX notation
The first six rows of Pascal's triangle are shown below, beginning with row 0.

How many of the first 100 rows contain at least one even entry and no odd entries other than $1$? (Rows 2 and 4 have this property, for example.)

\begin{tabular}{ccccccccccc}
&&&&&1&&&&&\\
&&&&1&&1&&&&\\
&&&1&&2&&1&&&\\
&&1&&3&&3&&1&&\\
&1&&4&&6&&4&&1&\\
1&&5&&10&&10&&5&&1\\
\end{tabular}

level

Level 4

type

Counting & Probability

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Official source

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