5pr=26pr-1 , find r

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5pr=26pr-1 , find r

Posted by Tarun Kumar 4 years, 7 months ago

ICSE & ISC > Class 11 > Mathematics

1 answers

Tarun Kumar 4 years, 7 months ago

5/(5-r)=26/6+r+1 5(5-r)=2*6*5/(6-r+1)(6-r)(5-r) (7-r)(6-r)=12 42-7r-6r-r2=12 -13r+r2+42-12=0 R2-13r+30=0 r2-3r-10r+30=0 r(r-3)-10(r-3)=0 =(r-3) (r-10) =r-3=0 , r-10=0 r=3, r=10 (r is greater than n)

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