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Find the sum 2xx5+5xx9+8xx13+11xx17+.. n...

Find the sum `2xx5+5xx9+8xx13+11xx17+..` n terms.

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To find the sum of the series \( S = 2 \times 5 + 5 \times 9 + 8 \times 13 + 11 \times 17 + \ldots \) up to \( n \) terms, we can follow these steps: ### Step 1: Identify the first factors of the series The first factors in the series are: - 2, 5, 8, 11, ... This is an arithmetic progression (AP) where: - First term \( a_1 = 2 \) ...
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Knowledge Check

  • Find the product : {(-9)xx8}xx(-5)

    A
    `380`
    B
    `432`
    C
    `320`
    D
    `360`

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