Question 19
Suppose that $\{a_n\}$ is an arithmetic sequence with $$
a_1 + a_2 + \cdots + a_{100} = 100
$$ and $$
a_{101} + a_{102} + \cdots + a_{200} = 200.
$$ What is the value of $a_2 - a_1?$
a_1 + a_2 + \cdots + a_{100} = 100
$$ and $$
a_{101} + a_{102} + \cdots + a_{200} = 200.
$$ What is the value of $a_2 - a_1?$