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If the sum of the first 23 terms of an a...

If the sum of the first 23 terms of an arithmetic progression equals that of the first 37 terms , then the sum of the first 60 terms equals .

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If the sum of the first 11 terms of an arithmetical progression equals that of the first 19 terms,then the sum of its first 30 terms,is (A) equal to 0 (B) equal to -1 (C) equal to 1 (D) non unique

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Knowledge Check

  • If the sum of first 11 terms of an arithmetic progression equal that of the first 19 terms, Then, what si the sum of first 30 terms?

    A
    0
    B
    -1
    C
    1
    D
    Not unique

  • What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26

    A
    104
    B
    140
    C
    84
    D
    98

  • What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and the last term is 55

    A
    219
    B
    137
    C
    231
    D
    279