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

What is the sum of the first 12 terms of an arithmetic progression, if the first term is 3 and the last term is 47?

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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

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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?

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

Suppose the sum of the first m teams of a arithmetic progression is n and the sum of its first n terms is m, where mnen. Then the dum of the first (m + n) terms of the arithmetic progression is

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