120 = a + (a+1) + (a+2)a=39a+1=40=b
a+2=41=c
P= 1/2 a*b = 1/2*39*40=780
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120 = a + (a+1) + (a+2)
a=39
a+1=40=b
a+2=41=c
P= 1/2 a*b = 1/2*39*40=780