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Grade 10Algebra

1!+2!+........+95! Is devide by 15 .what will be the reminder of this

Profile image of Trishna mondal
8 Years agoGrade 10
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1 Answer

Profile image of Arun
8 Years ago
Dear Trishna
 
 

When 1!+2!+3!+4!+5!....(95)! is divided by 15all the factorails from 5! + 6! + 7! + ... (95)! are divisible by 15 as they contain 3*5 as one of their factor.

Thus the remainder can be found by dividing 1!+2!+3!+4! by 15 = 33 by 15. = 3

 

Regards

Arun