Find S25 for 3 + 7 + 11 + 15 + …
Find S11 for 3 + 1 + (-1) + (-3) +…
The following sequence is arithmetic.
2, -2, 2, -2, 2,…
Stacey Warren - Expert brainly.com
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The formula for the sum of n terms of an arithmetic sequence is
In question 4 the value of n is 25, a = 3 and d = 4. So just plug these values into the formula.
so 4 would be D ?
Yes, D is the correct choice. Can you do question 5 now?
Not the answer you are looking for? Search for more explanations.
is it B ?
In question 5, a = 3, d = -2 and n = 11. Can you plug these values into the formula and calculate again?
how do you find D ?
If you mean d in the formula, d is the common difference between terms. It is found by taking the second term and subtracting the first term from it. So in question 5, the second term is 1 and the first term is 3.
d = 1 - 3 = -2
Okay , So would my answer be A?
(11/2) [2(3)+(11-1)-2] This how i typed it in my calculater
Good work! A is the correct choice for question 5.