
an is the 'nth' term
a1 is first term
d=common difference (found by doing

)
n=numerical representation of which term
410 ?
Explanation : 4 comes from what you subtract and 10 comes from what the question would be if it was added
10 digits.
0, 1, 2, 3, 4, 5, 6, 7, 8, and 9