Question

sum of an arithmetic sequence 15 n+ 24 find first term and common difference ​

Answer 1

Answer:

$s = 15n + 24 \\ s 1 = 15 \times 1 + 24 = 39 \\ s2 = 15 \times 2 + 24 = 54 \\ a1 = s1 \\ a1 = 39 \\ a2 = s2 - s1 \\ a2 = 54 - 39 = 15 \\ d = 15 - 39 = 24$