Not much more than any other series like this. If you stop at the nth position the sume so far is n2. Because (n+1)2 is n2 + (2n+1), and 2n+1 are the odd numbers.
It is 77
1.66666666666666666667 because 3 plus 1 plus 1 equals 5 and 5 divided by 3 equals 1.6666666666666666666.7.
76
No, 1 + 2 + 3 + 4 + 5 = 15.
2/5 plus 1/3 plus 5/6 is equal to 1.57 or 1 57/100
It is 77
9+7+5+3+1 16+5+3+1 21+3+1 24+1 25
3+1+3+3+3+4+3+4+1+1+1+1+1+1+5+6 =41 Every operation is addition so all the adding can happen in one step.
1.66666666666666666667 because 3 plus 1 plus 1 equals 5 and 5 divided by 3 equals 1.6666666666666666666.7.
1+3+5+7+9=25
1 + 3 + 5 + 7 + 201 = 217
It is: -9+8+(-5)+3+1 = -2
5 - 3 + 1 = 3
8+1+5+5+3+8+10+30=70 The answer is 70
-1
76
No, 1 + 2 + 3 + 4 + 5 = 15.