Eighty percent of trees planted by a woodlands conservation group survive. What is the probability t

Eighty percent of trees planted by a woodlands conservation group survive. What is the probability that:
a.10 of the 12 trees just planted will survive?
b.at least 10 of the trees just planted will survive?
For part a, am I just suppose to multiply (.8) (10/12)?
I have no idea what to do for part b.
Thanks for your help.

 

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