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Set of values of r for which, .^(18)C...

Set of values of r for which,
`.^(18)C_(r-2)+2.^(18)C_(r-1)+ ^(18)C_(r) ge .^(20)C_(13)` contains

A

4 elements

B

5 elements

C

7 elements

D

10 elements

Text Solution

Verified by Experts

The correct Answer is:
C
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