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there are 2 ways to approach this

P(0) + P(1)

... or is the compliment; does not rain at most 1 day out of the week?

@amistre64 how do we solve the equation ?

im thinking the 1 - P0+P1 is quicker "by hand"\[1-\binom{7}{0}~.2^0.8^7-\binom{7}{1}~.2^1.8^6\]

Can you solve the equation step by step @amistre64

\[\infty \] ways

7 ways

oh, you do agree :) good.

now we can do the elementary stuff
\[ 1 - (1~.2^0~.8^7+7~.2^1~.8^6)\]

Ok so what will it be ?