7. Find rif (i) P, 2Â°P-

1.	7. Find rif (i) P, 2Â°P-
Answer» 5Pr = 2 * 6P(r-1) 5!/(5-r)! = 26!/(6-r+1)! 5!/(5-r)! = 265!/(7-r)! 1/(5-r)! = 12/((7-r)(6-r)(5-r)!) 42-13r+rr = 12 r*r - 13r + 30 = 0 (r-10)(r-3) = 0 r = 3,10 If you find this answer helpful then like it.

Answer»

5Pr = 2 * 6P(r-1) 5!/(5-r)! = 2*6!/(6-r+1)! 5!/(5-r)! = 2*6*5!/(7-r)! 1/(5-r)! = 12/((7-r)(6-r)(5-r)!) 42-13r+r*r = 12 r*r - 13r + 30 = 0 (r-10)(r-3) = 0 r = 3,10

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7. Find rif (i) P, 2Â°P-

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