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If \ ^(k+5)P(k+1)=(11(k-1))/2dot\ ^(k+3)...

If `\ ^(k+5)P_(k+1)=(11(k-1))/2dot\ ^(k+3)P_(k\ )P_k` then the values of `k` are `7\ a n d\ 11` b. `6\ a n d\ 7` c. `2\ a n d\ 11` d. `2\ a n d\ 6`

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