Q: What is the sum of 1 plus 2 plus 3 plus 4 plus 5 plus 4 plus 3 plus 2 plus 1?

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Sum = 79*(79+1)/2 = 79*80/2 = 3160

5050

41

The sum of -1 and -2 is -3.

The sum of 1/8 and 3/8 is 1/2

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3

Sum = 79*(79+1)/2 = 79*80/2 = 3160

3

if (n%2==0) sum=n/2*(n+1); else sum=(n+1)/2*n;

87

5050

41

The sum of 2/9 and 1/3 is 5/9

The sum of -1 and -2 is -3.

1+2+3+4.....+100 = 101*50= 5050

The sum of 3x plus 2 and -4 plus 3 is 3x+1 if the equation is (3x+2)+(-4+3). If they are two separate questions, 3x+2 remains as itself while -4+3=-1.

The sum of 2/3 and 1/2 is 1 1/6