Answers

  • Brainly User
2016-03-06T17:49:28+08:00
A₂₁ = 8 + (21 - 1) (4)

a₂₁ = 8 + (20) (4)

a₂₁ = 8 + 80

a₂₁ = 88

The 21st term is 88.
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