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    				| 1. | समान्तर श्रेणी 14, 9, 4, – 1, – 6,… का 12 वाँ पद ज्ञात कीजिए। | 
| Answer» समान्तर श्रेणी 14, 9, 4, – 1, – 6…. यहाँ a = 14,d = – 5 अतः a12 = a + (12 – 1)d = a + 11d = 14 + 11 × – 5 = 14 – 55 = – 41 | |