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एक समान्तर श्रेणी के प्रथम सात पदों का योग 182 है। यदि इसका 4 वाँ पद तथा 17 वाँ पद 1 : 5 के अनुपात में है तो समान्तर श्रेणी ज्ञात कीजिए।

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माना, समान्तर श्रेणी का प्रथम पद a तथा सार्वअन्तर d है।

तब, प्रश्नानुसार, 

समान्तर श्रेणी के प्रथम 7 पदों का योग = 182

∴ a + a + d + a + 2d + a + 3d + a + 4d + a + 5d + a + 6d = 182

7a + 21d = 182

a + 3d = 26 …(1)

d का मान समीकरण (1) में रखने पर

a + 3 × 8 = 26

या a + 24 = 26

या a = 26 – 24 = 2

a = 2 तथा d = 8

अतः समान्तर श्रेणी a, a + d, a + 2d….

= 2, 2 + 8, 2 + 2 × 8….

= 2, 10, 2 + 16….

= 2, 10, 18, ….

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