General Maths Puzzle Numerical Ability

Let's take a fair (unbiased) coin and toss it 10 times. What is the probability getting at least 1 head in any of the trials?
a) 1/10
b) 1/20
c) 1/(2^10)
d) 1-(1/(2^10))
Explain:

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Answer d
In ten trials the probability of getting a head=1/2^10
Hence for atleast 1 head=1-1/2^10.
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General Other Question

How to evaluate the expression. round answer to two decimal places.
(1.49)(-0.5)? In the above coin toss if you bet on heads in 9 trials and lost every time. Given this, what can you conclude?
a) Although the coin is fair, the game is rigged against you.
b) You are very likely to get a head in the 10 trial?
c) You should start betting on tails as that's the outcome that seems more likely.
d) You have just been unlucky.
Explain: