See what we can offer to your school
"SimpleStudy just makes sense...”
Get the best plan for your school
10 questions from this quiz
The sum of terms in a sequence
SnS_nSn
∣r∣<1|r| < 1∣r∣<1
Below the sigma symbol
555
∑i=1nai+∑i=1nbi\sum_{i=1}^{n} a_i + \sum_{i=1}^{n} b_i∑i=1nai+∑i=1nbi
c⋅∑i=1naic \cdot \sum_{i=1}^{n} a_ic⋅∑i=1nai
Sn=n2(2a+(n−1)d)S_n = \frac{n}{2}(2a + (n-1)d)Sn=2n(2a+(n−1)d)
Sn=a1−rn1−rS_n = a \frac{1 - r^n}{1 - r}Sn=a1−r1−rn
S∞=a1−rS_∞ = \frac{a}{1 - r}S∞=1−ra
Select your subjects, and get access to A+ resources today.