Question #299666

Find the last digit of the sum

0! + 2! + 4! +...+ 2010! + 2012!


Please show full steps answer.

1
Expert's answer
2022-02-21T14:06:46-0500

By definition 5!=54321=1205!=5\cdot4\cdot3\cdot2\cdot1=120. Thus, for all numbers of the sum that are greater than 5!5! (those numbers are 6!,7!,...6!,7!,... ) the last digit is 0. Thus, it is enough to compute the sum of the following terms: 0!+1!+2!+3!+4!=1+1+4+6+24=360!+1!+2!+3!+4!=1+1+4+6+24=36. Thus, the last digit of the sum is 6.

Answer: 6.

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