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Find thevalue of 'r': (i) .^(12)P(r) =...

Find thevalue of 'r':
(i) `.^(12)P_(r) = 1320`
(ii) `.^(56)P_(r+6): .^(54)P_(r+3) = 30800 :1`
(iii) `5.^(4)P_(r) = 6.^(5)P_(r-1)`
(iv) `.^(9)P_(5) +5 .^(9)P_(4) = 10 P_(r)`

Text Solution

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The correct Answer is:
(i) 3 (ii) 41 (iii) 3 (iv) 5
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