(a+b)+(a+c)+(a+d)+(b+c)+(b+d)+(c+d)
= 2a + 2b + 2c + 2d
= 2(a + b + c + d)
Since a + b + c + d = 1.5,
2(1.5) = 3
Therefore, the value of the expression is 3.
(a+b)+(a+c)+(a+d)+(b+c)+(b+d)+(c+d)
= 2a + 2b + 2c + 2d
= 2(a + b + c + d)
Since a + b + c + d = 1.5,
2(1.5) = 3
Therefore, the value of the expression is 3.