If three coins are tossed, how many possible ways are there of at least one coin showing tails? | MATHalino

If three coins are tossed, how many possible ways are there of at least one coin showing tails?

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Multiple Choice Questions (MCQ) uploaded before May 2024

Find the value of x if $x = \dfrac{1 + \tan^2 \phi}{\tan \phi \, \csc^2 \phi}$.
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