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If 20Delta30 = 5, 90Delta40 = 13 and 20D...

If 20`Delta`30 = 5, 90`Delta`40 = 13 and 20`Delta`20 = 4, then find the value of 90`Delta`80 = ?

A

14

B

20

C

16

D

17

Text Solution

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The correct Answer is:
A
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