Question 1040102
There are 4 possible outcomes,
BB
BW
WB
WW
Calculate the probabilities of each. 
I wont simplify values until the end.
First with replacement,
{{{P(BB)=(4/10)(4/10)=16/100}}}
{{{P(BW)=(4/10)(6/10)=24/100}}}
{{{P(WB)=(6/10)(4/10)=24/100}}}
{{{P(WW)=(6/10)(6/10)=36/100}}}
So then,
{{{P=24/100+24/100=48/100=12/25}}}
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Without replacement,
{{{P(BB)=(4/10)(3/9)=12/90}}}
{{{P(BW)=(4/10)(6/9)=24/90}}}
{{{P(WB)=(6/10)(4/9)=24/90}}}
{{{P(WW)=(6/10)(5/10)=30/100}}}
So then,
{{{P=24/90+24/90=48/90=24/45}}}