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If 5Delta1 = 40, 9Delta9 = 0 and 7Delta1...

If 5`Delta`1 = 40, 9`Delta`9 = 0 and 7`Delta`1 = 60, then find the value of 4`Delta`9 = ?

A

80

B

-30

C

-50

D

-90

Text Solution

Verified by Experts

The correct Answer is:
C
-50
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