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Maths Puzzle
The units digit of the sum of the first 75 positive integers (that is 1 + 2 + 3 + ... + 75 ) is
Read Solution (Total 2)
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- n(n+1)/2;
0 is ans
- 11 years agoHelpfull: Yes(0) No(0)
- n(n+1)/2;
n=75;n+1=76
76/2=38;
8*5=40
units digit is 0 - 11 years agoHelpfull: Yes(0) No(0)
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