# Doubt from probability

Is the answer A?

Do you know about the formula to not select consecutive things

n-r+1\choose r ?

Hence answer is \frac{20-4+1\choose 4}{20\choose 4}

1 Like

Is the answer A?

n-r+1\choose r ?

Hence answer is \frac{20-4+1\choose 4}{20\choose 4}

1 Like