The value of Σ r = 1 to 10 r.rPr = ?
Quantitative Aptitude - Ex - 5 (B) Q. 12 Page No. 5.14
Ans. 11 P 11 - 1
Kindly explain in detail
Thank you !
5 Replies
Tejaswi Kasturi
(student-cpt)
(427 Points)
Replied 29 April 2012
rPr = r! now r*r! can be written as (r+1-1)*r!
= (r+1)*r! – r!
=(r+1)! – r!
1*1P1 = 2! – 1!
2*2P2 = 3! – 2!
3*3P3 = 4! – 3!
So on
By adding all of them we get ultimately 11! -1
Joy
(NA)
(25 Points)
Replied 29 April 2012
Appreciate and Cheers ! Mr. Tejaswi Kasturi ! Looking for more assistance in the future ! Thanks !!
Joy
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(Medical Rep)
(22 Points)
Replied 14 June 2018
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hendry jullius
(seo)
(24 Points)
Replied 03 August 2018
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