Thursday, 23 October 2025

What least number must be added to each of the numbers 6, 15, 20 and 43 to make them proportional ? [ICSE 2013]

 





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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)!