Question

six identical coins are arranged in a row .The no.of ways in which no.of tails is equal to no.of heads us

Answer 1

Hi ..here is your answer...
they can be arranged in 20 ways

Answer 2

Answer:

The number of ways in which no. of tails is equal to the no. of heads = 20 ways

Step-by-step explanation:

Number of identical coins = 6

For equal number of heads and tails, among 6 coins three heads will have to accompany three tails.  

$\text{Out of 6 coins, 3 heads can be obtained in }_{3}^{6}\textrm{C}\text{ ways}\\\\\bf\implies \textbf{Required number of ways = }\frac{6!}{3!\times 3!}=20$

Hence, The number of ways in which no. of tails is equal to the no. of heads = 20 ways