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in Arithmetic Progression by (44.4k points)
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एक समान्तर श्रेणी का सार्वअन्तर ज्ञात कीजिए जिसमें a25 – a12 = – 52

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दिया है, 

a25 – a12 = – 52

⇒ a + 24d – a – 11d = –52

⇒ 24d – 11d = -52

⇒ 13d = -52

⇒ d = – 4

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