The probability is 3/4.
The probability of getting two tails in the first two is 1/4. And it does not matter how many more times the coins are tossed after the first two tosses.
The probability of tossing two heads in two coins is 0.25.
It is 1/2^7 = 1/128.
1/2 or 50% (1/8 prob of 0H + 3/8 prob of 1H)
The probability is 3/8 = 0.375
one out of four