find the remainder when- is divided by 10. No idea. i just know the sum of n.n!=(n+1)!-1
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Originally Posted by adhyeta find the remainder when- is divided by 10. No idea. i just know the sum of n.n!=(n+1)!-1 Notice for each term is divisable by 10 so they have a remainder of zero(why) Now we only need to worry about the first 4 terms We also don't need to worry about the 4 term (why) so we get so the remainder is 6
Originally Posted by TheEmptySet Notice for each term is divisable by 10 so they have a remainder of zero(why) Now we only need to worry about the first 4 terms We also don't need to worry about the 4 term (why) so we get so the remainder is 6 yes for the fourth term too we have 16+4=20 (hence, divisible by 10) thank you.
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