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If 18$2 = 10, 8$4 = 6 and 12$18 = 15, th...

If 18$2 = 10, 8$4 = 6 and 12$18 = 15, then find the value of 7$9 = ?

A

12

B

20

C

8

D

18

Text Solution

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The correct Answer is:
C
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