3 _, _, 20 (arithmetic)
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Answer:
3, 8 2/3, 22 2/3
Step-by-step explanation:
An=A1+(n-1)d
20=3+(4-1)d
20=3+3d
20-3=3d
17=3d
17/3=3d/3
17/3=d
An=3+(2-1)17/3
Asub2=3+17/3
=8 2/3
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