The probability that event M will not occur is 0.8 and the probability that event R will not occur is 0.7. If events M and R cannot both occur, which of the following is the probability that either event M or event R will occur?  Pick.
A) 1/2 B) 2/5 C) 3/5 D) 4/5 E) 12/25
p(m) =0.2   p(r) =0.3   p(m intersection r) = 0 (If events M and R cannot both occur)   p(m or r) = 0.2+0.3= 
<gadget id="calculator">0.2+0.3</gadget>
<output>0.5</output>
0.5   Corrected !!   1/2nswer 1/2
<result>A</result>
The probability that event M will not occur is 0.8 and the probability that event R will not occur is 0.7. If events M and R cannot both occur, which of the following is the probability that either event M or event R will occur?