Monday, 27 October 2025

If x,y,z are in continued proportion; then prove that (x+y)²/(y+z)² = x/z. [icse 2010]


 

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If find x. 1/(9!) + 1/(10!) = x/(11!).

  Here n! is read as n factorial. It can be written as n(n-1)! or n(n-1)(n-1)!