(7+1) and (7-1)
the next number in the sequence is 25............starting at the beginning, you add the odd numbers to the existing number to get the answer. Add "1" to 0, get 1; add "3" to 1, get 4; add "5" to 4, get 9; add "7" to 9 to get 16........and add "9" to 16 to get 25.........
20100
0 but if you add 1+1-1 it is 1
you get 2
If you add 0.39 to 0.61 you get 1
if you add 1+1 it = 2 get it :D
(7+1) and (7-1)
You cannot add 3x and 1. You can add 3x and x and get 4x though.
1 and a half add 1 and two thirds = 2
It is: 33+211+1 = 245
add 9 add 1 subtract 20 add 9 add 1
because if you add 1 to 12 you will get one more not less.
12, 13, 16 Add three, then add 1, then add three, then add 1, and so on so forth
1
2
You start with 1 and add 1. add another 1 and another. In all, do the addition 9,999,999,999 times.