Answer:
A coin is tossed 4 times. So the sample space is {HHHH, HHHT, HHTT, HTTT, TTTT, TTTH, TTHH, THHH, HTHT, THTH, HTHH, HHTH, HTTH, THHT, THTT, TTHT}
There are 16 sample points. This can be found out by knowing how many objects(or times the same object) is tossed/rolled(for a dice). Sample points = (Outcomes)^no. Of times
16 = 2^4
The answer is 4/16 = 1/4
Hope this helps!