Progression | Mathematics | Page 1

sleek sandal Jun 1, 2025, 2:54 PM

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What did i do wrong for b? The answers are 1460

vague cypressBOT Jun 1, 2025, 2:54 PM

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swift tiger Jun 1, 2025, 3:02 PM

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Can you explain your work?

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I am unfamiliar with the method you are using

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@sleek sandal

sleek sandal Jun 1, 2025, 3:04 PM

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For a or b?

swift tiger Jun 1, 2025, 3:04 PM

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B

sleek sandal Jun 1, 2025, 3:06 PM

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I use formula number 10

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S20-S3

hardy condor Jun 1, 2025, 3:11 PM

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Shouldn't it be s23 - s3?

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Because it is asking for 20 terms

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S20 - s3 gives sum of 17 terms

swift tiger Jun 1, 2025, 3:12 PM

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The sum for the first 23 terms should be 1472

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Subtracting 12 will give you your answer

hardy condor Jun 1, 2025, 3:13 PM

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You should just take a = 4 th term of this sequence and the d will be same

sleek sandal Jun 1, 2025, 3:13 PM

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OH

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Rightt o understand

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Thanks

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.solved

#Progression