Question

Six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads is:

• A. 20
• B. 9
• C. 120
• D. 40

Hint:

The number of ways to arrange objects with repetition is given by the combination formula \( \binom{n}{r} \).

Answer 1

The Correct Option is A

The number of ways to arrange 3 heads and 3 tails in a row is given by \( \binom{6}{3} = 20 \).
Final Answer: \[ \boxed{20} \]