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If 5Δ1 = 40, 9Δ9 = 0 and 7Δ1 = 60, then find th...
1.
If 5Δ1 = 40, 9Δ9 = 0 and 7Δ1 = 60, then find the value of 4Δ9 = ?
A.
80
B.
-30
C.
-50
D.
-90
Answer» D. -90
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