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Question

Let P and Q be respectively the sum of first 20 terms and the sum of first 40 terms of the series 1 + 4 + 3 + 8 + 5 + 12 + ….. The value of QP equals

माना PQ श्रेणी 1 + 4 + 3 + 8 + 5 + 12 + ….. के क्रमशः प्रथम 20 पदों के योगफल तथा प्रथम 40 पदों के योगफल को दर्शाते है। तब Q – P का मान बराबर है

A
1560
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B
320
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C
920
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D
1240
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Solution

The correct option is C 920
Solution

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