The probability of tossing heads and not rolling 5 is 31/32.
Let us assume a coin is fair and 2-sided. 
A coin usually flips heads or tails. 
Then to flip heads or tails equals  1/2
 Consider flipping a coin 5 times. 
Since a coin flip has two outcomes, then a coin flip 5 times has 2 
5 =32 outcomes.
We may show the outcomes, e.g. use sample space S. 
Then (1)S=(H,H,H,H,H),(H,H,H,H,T),…,(T,H,H,H,H),(T,T,T,T,T)
It must follow ∣S∣=32. 
A helpful way to see may be S=H, T 5=H, Tx…Hx, T. 
<h3>What is the formula for probability?</h3>
P(S)=1-P(A)
If you see the complement of at least 1 tail means 0 tails or 5 heads, then we must surely see 1 outcome, e.g. all heads. 
Then it must follow at least one tail that has 31 outcomes,e.g.32–1=31.
To find or compute the probability, then fevorable possible in outcomes.
 It means 31/32, 
 P(E)=1– 32/1= 32/31
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