Q. If 5Δ1 = 40, 9Δ9 = 0 and 7Δ1 = 60, then find the value of 4Δ9 = ?
A) -30
B) 80
C) -90
D) -50
✔ Correct Answer: -50
Exam Insight
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A) -30
B) 80
C) -90
D) -50
✔ Correct Answer: -50
-
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