an unbaised coin is tossed until it shows up the same face in 2 consicative throws wat is the probability that the no of tosses is not more than 4.  Choose one.
A) 3 / 4  B) 1 / 4  C) 7 / 8  D) 1 / 8  E) 6 / 8

Rationale: using 0 and 1 for head and tail respectively and considering binary system , we find that out of 16 possibilities , 14 are desired options . then probability = 14 / 16 = 7 / 8 answer : c
Answer: C