Find the sum of odd numbers from single digit smallest number to highest double digit number​

Question

Find the sum of odd numbers from single digit
smallest number to highest double digit number​

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Katherine 4 days 2021-10-10T09:23:51+00:00 1 Answer 0 views 0

Answers ( )

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    2021-10-10T09:25:48+00:00

    Answer:

    2500

    Step-by-step explanation:

    a = 1

    l = 99

    d = 2

    tn = a + (n – 1) d

    99 = 1 + (n – 1) 2

    98 = 2n – 2

    100 = 2n

    n = 50

    Sn = n/2 * (a + l)

    = 50/2 * (1 + 99)

    = 25 * 100.

    = 2500

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