If 5 Δ 1 = 40, 9 Δ 9 = 0 and 7 Δ 1 = 60, then find the value of 4 � – McqOptions

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

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