Dear Sandeep Reddy M,If you will read carefully, you will get the real sence of the question.
The question of friday was "A tail has occurred in a coin, then probability of getting an even number in the dice would be"
It doesn't mean that the tail will come in the first coin, there is also a case in which head will come first after that tail will come so totally 7 cases are there in which 3 cases are favourable.Thus probability is 3/7