I've noticed this question in an exam paper:

X is Bin(12,0.45)

a) Find $\displaystyle p(X\geq7)$

I could do this the long way which is to find $\displaystyle p(x=0)+p(x=1)+p(x=2)+p(x=3)+p(x=4)+p(x=5)+p(x=6)$ and then do one take away from this answer, but the question is two marks: surely there's a shorter method?

Edit:woops. mucked up the title...