1.

If a, b, c and d satisfy the equations
a + 7b + 3c + 5d = 0,
8a + 4b + 6c + 2d = 4
2a + 6b + 4c + 8d = 4,
5a + 3b + 7c + d = 4,
then
(a + d)
 = ?
(b + c)
A. 0
B. 1
C. 1
D. 4
Answer» D. 4


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