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If "^12Pr = "^11P6 + 6 ."^11P5 then r ...

If ` "^12P_r `=` "^11P_6 ` `+` 6 .`"^11P_5` then r is equal to

A

1) 5

B

2) 6

C

3) 7

D

4) 4

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