Project ID:
7100000011
Accepted:
Type:
Layout:
Question:
Match the given arithmetic sequences $(a_n)_{n=1}^{\infty}$ with their sought terms $(a_n)$, common differences $(d)$, or partial sums $(s_n)$.
Question 1:
$a_n=-1+2n;\ a_1=?$
Answer 1:
$1$
Question 2:
$a_n=2-\frac{n}{2};\ d=?$
Answer 2:
$-\frac12$
Question 3:
$a_1=-3;\ d=2;\ s_4=?$
Answer 3:
$0$
Question 4:
$a_1=5;\ d=-2;\ a_4=?$
Answer 4:
$-1$
Question 5:
$a_1=4;\ a_4=-2;\ d=?$
Answer 5:
$-2$
Question 6:
$a_3=-1;\ a_5=5;\ a_4=?$
Answer 6:
$2$
Question 7:
$a_1=2;\ a_5=4;\ s_5=?$
Answer 7:
$15$
Question 8:
$a_2=2;\ a_6=4;\ d=?$
Answer 8:
$\frac12$
Question 9:
$a_n=-n;\ s_5=?$
Answer 9:
$-15$