If a+b= 6 and a-b= 4 . Find ab
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a+b=6 is 1st equation
a-b=4 is 2nd equation
add both
a+b+a-b=4+6
2a=10
a=10÷2
a=5
b=1(5+b=6, b=6-5, b=1)
ab=5x1=5
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