Write the sample space for the experiment of tossing a coin four times.
Since four coins are tossed, so the possibilities are either
HHHH or TTTT or HHHT or HHTH or
HTHH or THHH or HHTT or HTTH or
HTHT or THHT or THTH or TTHH or
HTTT or THTT or TTHT or TTTH
It means number of elements in sample space = 24=16
S = {HHHH, TTTT, HHHT, HHTH,
HTHH, THHH, HHTT, HTTH, HTHT,
THHT, THTH, TTHH, HTTT, THTT,
TTHT, TTTH}