Q: Find the sum of 1 9 plus 5 9 plus 2 9?

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

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

1+1+2 = 4

2

2

The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1

1+2+4 = 7

2 + 1 = 3

You add 1 plus another one and you get 2

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

(xn+2-1)/(x2-1)

3

3

87

3x2 + 2x + 3 + x2 + x + 1 = 4x 2+ 3x + 4

25

26

The mater is that if you do 1+1=2 then just add the sum with its self, so you have 2+2=4 and 4 is the answer

1 plus 1

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

Its sum is: 1/2+1/2 = 1

5050

81*82/2= 3321

Yes. Sum of powers of 2 from 20 to 2n is (2(n + 1) - 1) or (2 x 2n) -1 So sum of 1 + 2...+ 4096 is 8192 - 1 ie 8191.

A window. 2? No actually it 21479758456895