Answer:
To find an in the arithmetic sequence, we can use the formula:
an = a1 + (n-1) • d
Given that a¹ = 12 , d = 3 , and n = 24 , we can substitute these values into the formula to find a²⁴ :
a²⁴ = 12 + (24 - 1) • 3
Simplifying:
a²⁴ = 12 + 23 • 3
a²⁴ = 12 + 69
a²⁴ = 81
Therefore, a²⁴ = 81 in the given arithmetic sequence.