Question

8 identical coins are arranged in a row .the total number of ways in which the number of heads are equal to number of tails is?

Answer 1

Since we need to have equal number of heads and tails

⇒ there must be 4 heads and 4 tails

Find the number of combinations to get 4 heads:

Number of combination = 8C4

Number of combination = (8 x 7 x 6 x 5) / ( 4 x 3 x 2 x 1)

Number of combination = 70

Answer: There are 70 ways