Sunday, 30 July 2023

Sumit is 3 times old as his son.Five years later, he will be two and a half times as old as his son. How old is Summit at present? (cbse 2019)


 

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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)!