An algebra problem by Samriddhi Singha Roy

Algebra Level 2

Calculate the digit in the unit's place of the number 2! + 3! +...........99! .


The answer is 2.

Samriddhi Singha Roy by Samriddhi Singha Roy , 20, India

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2 solutions

Vaibhav Prasad
May 31, 2015

The answer to this problem is wrong

It must be 3 3

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oh, yes. sorry. seems I had missed out 1!

Samriddhi Singha Roy - 6 years ago

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its allright

u can change the question to " give the answer-1 in the box"

Vaibhav Prasad - 6 years ago

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thanks. I think there should be an option of editing the answer also.

Samriddhi Singha Roy - 6 years ago

first calculate upto 2! , 3!, 4! , 5! , and 6! . from 5! onwards the last digit will be 0 . so we add till the last digit of 4! which is as follows: 2+6+4 = 12. so the last digit is 2.

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