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Answer:
24th term: 72
sum of first 24 terms: 900
Explanation:
a_n = a_1 + d(n - 1)
a_24 = 3 + 3(24 - 1)
a_24 = 3 + 69
a_24 = 72
S_n = n(a_1 + a_n)/2
S_24 = 24(3 + 72)/2
S_24 = 900
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