(chatquestion)...69. Let A be the sum of the first 20 terms and B be the sum of the first 40 terms of the series 1' +2-2° +3 +2+4 +5° + 2+6° +. If B-2A=100 2, then 2 is equal to: 232 (1) (2) (3) (4) 248 464 496

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