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1. |
If a + b + c + d = 4, then find the value of1 + 1 + 1 + 1 . (1 a)(1 b)(1 c)(1 b)(1 c)(1 d)(1 c)(1 d)(1 a)(1 d)(1 a)(1 b) |
A. | 0 |
B. | 5 |
C. | 1 |
D. | 4 |
Answer» B. 5 | |