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कि TV Rl eF RNउदाहरण 5. समान्तर श्रेढ़ी 17, 15, 13, ..... के कितने पदों का |
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Answer» a = 17 d = -2 72 = n/2(2a+(n-1)d) 144 = n(34-2n+2) 144 = n(36-2n) 36n-2n*n-144 = 0 2n*n - 36n + 144 = 0 n*n - 18n + 72 = 0 (n-12)(n-6) = 0 n = 6 n= 12 |
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