1<span>, 4, 7, 10 is a sequence starting with </span>1<span>. You get the next </span>term<span> by adding 3 to the previous </span>term. You are often asked to find a formula for the nth term<span>. As the common difference is 3, try </span>3n<span>. When n = </span>1<span>, </span>3n<span> = 3, and we subtract 2 to make the first </span>term<span> correct.</span>
