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Find the sum of arithmetic sequence -4, -1, 2, 5, ... up to 10 terms.
95
87
56
Find the sum of the first 30 terms of the sequence 1, 3, 5, 7, 9 ….
495
900
780
What is the sum of the first thirty terms of the arithmetic sequence
50, 45, 40, 35, ... ?
-675
453
576
What is the sum of the first sixteen terms of the arithmetic sequence
1, 5, 9, 13, ... ?
496
567
345
Using the sum of arithmetic sequence formula, calculate the sum of the first 20 terms of the sequence 1, 5, 9, 13,….
775
Select the formula for sum of arithmetic sequence with first term ' a1 and common difference 'd'.
Sn=2an+3S_n=2a_n+3Sn=2an+3
Sn=n2[2a1+and]S_n=\frac{n}{2}[2a_1+a_nd]Sn=2n[2a1+and]
Sn=n2[2a1+(n−1)d]S_n=\frac{n}{2}[2a_1+(n-1)d]Sn=2n[2a1+(n−1)d]
Add up the first 10 terms of the arithmetic sequence:
{ 1, 4, 7, 10, 13, ... }
195
112
145
Select the formula for sum of arithmetic sequence with first term ' a1 and last term an.
Sn=2n+3S_n=2n+3Sn=2n+3
Sn=n2[a1+an]S_n=\frac{n}{2}[a_1+a_n]Sn=2n[a1+an]
Sn=(−1)nn2S_n=(-1)^nn^2Sn=(−1)nn2
Find the sum of 7 terms of an arithmetic sequence whose first and last terms are 10 and 40 respectively.
175
156
It is done.