1 + 4 = 5
1+2+4 = 7
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1
26
25
1+0+3 is the digit sum of 103
Sum = 79*(79+1)/2 = 79*80/2 = 3160
The answer is 1830.
plus indicates that it is a sum (not a difference): 1/4 + 2/4 = 3/4. You can just add the numerators, since the denominators are the same.
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
The sum of 1/2 and 4/8 is 1.
(-4) + (5) = 1 [positive one]
1 and 3/4