Answer:
75
Explanation:
you need to divide numbers by 3
3×25=75
147
Arithmetic sequence:
a = first term = 3
d = common difference = second term - first term
= 9 - 3
d = 6
n = 25
= 3 + (25 - 1)*6
= 3 + 24*6
= 3 + 144
= 147
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