Answer:
The first answer is d and second answer is a
Step-by-step explanation:
[tex]\sum_{i=1}^{11}{(3i^2-8)}[/tex]
[tex]\sum_{i=1}^{11}{(3i^2)}-\sum_{i=1}^{11}8[/tex]
[tex]3\sum_{i=1}^{11}{(i^2)}-\sum_{i=1}^{11}8[/tex]
3×n×(n+1)×(2n+1)/6 - 8×n
Putting n = 11
3×11×22×23/6 - 8×11
1430
The answer is 1430 option d
We have to find an expression for 10 terms of the series 3/4 + 9/8 +
3/2...................................................
[tex]\sum_{i=1}^{10}(3n/8+3/8)[/tex]
Evaluating the the expansion we get the first option as answer by
substituting the values of i's
The answer is option a [tex]\sum_{i=1}^{10}(3n/8+3/8)[/tex]
