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The number of 4 letter words that can be formed with the letters in the word EQUATION with atleast one letter repeated is
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Verified Answer
The correct answer is:
2416
Total number of ways $=8^4$
$\therefore$ Required number of ways of 4 letter words that can be formed by the word 'EQUATION' when atleast one letter repeated is
$$
\begin{aligned}
& =8^4-{ }^8 P_4=4096-1680 \\
& =2416
\end{aligned}
$$
$\therefore$ Required number of ways of 4 letter words that can be formed by the word 'EQUATION' when atleast one letter repeated is
$$
\begin{aligned}
& =8^4-{ }^8 P_4=4096-1680 \\
& =2416
\end{aligned}
$$
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