D=event that chip selected is defective
d=event that chip selected is NOT defective
Four possible scenarios for the first two selections:
P(DDD)=15/100*14/99*13/98=13/4620
P(DdD)=15/100*85/99*14/98=17/924
P(dDD)=85/100*15/99*14/99=17/924
P(ddD)=85/100*84/99*15/98=17/154
Probability of third selection being defective is the sum of all cases,
P(XXD)=P(DDD)+P(DdD)+P(dDD)+P(ddD)
=3/20
She bought 4 brushes at $3 each
And 8 tubes of paint at $ .50 each
3x4=12
.50x8=4
12+4=16
The answer is 3 1/2 or in decimal form it is 3.5
49. 100-36= how many girls in percent
= 64%
64%= 16 girls
64/100=16/x
cross multiply
1600=64x
x=25
<span>=<span>14/15</span></span><span>(Decimal: 0.933333)</span>
