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What is the sum of 1 plus 2 plus 3 plus... Plus 81?
81*82/2= 3321
Find the sum of 1 plus 2 plus 3 plus . plus n nos using c program?
if (n%2==0) sum=n/2*(n+1); else sum=(n+1)/2*n;
How do you find the sum of 1 plus 2 plus 3 plus 4 plus . plus 79?
Sum = 79*(79+1)/2 = 79*80/2 = 3160
What is the sum of 1 plus 1?
2
What is the sum to 1 plus 1?
2
What is sum of the following1 plus 2 plus 4 plus 8 plus 16 plus?
The sum of the numbers given is 31. 1 + 2 + 4 + 8 + ... + 2n = 2n+1 - 1
What is the sum of 1 plus 2 plus 4?
1+2+4 = 7
Why is 1 plus 1 equals 2 a sum?
You add 1 plus another one and you get 2
What 2 prime numbers have the sum of 81?
They are: 79+2 = 81
What is the sum of minus one plus minus one?
The sum of -1 and -1 is -2.
What is the answer to this sum 2 plus 1?
3
What is the sum of the first 81 odd numbers?
To find the sum of the first 81 odd numbers, we can use the formula for the sum of an arithmetic series: Sn = n/2 * (2a + (n-1)d), where n is the number of terms, a is the first term, and d is the common difference. In this case, n = 81, a = 1 (first odd number), and d = 2 (since the difference between consecutive odd numbers is 2). Plugging these values into the formula, we get: S81 = 81/2 * (2(1) + (81-1)2) = 81/2 * (2 + 160) = 81/2 * 162 = 6561. Therefore, the sum of the first 81 odd numbers is 6561.
