hilarypatricks
hilarypatricks hilarypatricks
  • 07-10-2021
  • Mathematics
contestada

The sum of the first 21 terms of the progression, - 18, - 15,-12.....is?​

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harnoorsidhu706
harnoorsidhu706 harnoorsidhu706
  • 07-10-2021
You can just use the tn formula to solve this tn= t1 + (n-1)d
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