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**1. Homework Statement**

coin tossed 70 times, find exact value for probability that number of heads is between 35 and 55

**2. Homework Equations**

NA

**3. The Attempt at a Solution**

P(heads) = 1/2;

and then I am not sure....

edit: ok, maybe something like this:

(1/2)*(35/70) - (1/2)*(55/70) ?? could someone confirm/correct?

Thanks in advance.

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