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Find the sum of the first (19) terms of the arithmetic progression (-12,-7,-2,\ldots).समांतर श्रेणी (-12,-7,-2,\ldots) के पहले (19) पदों का योग ज्ञात करें।
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (627)(627)
The nineteenth term is (78), so (S_{19}=\frac{19}{2}(-12+78)=627). The same formula works even when the progression starts with a negative term.उन्नीसवाँ पद (78) है, इसलिए (S_{19}=\frac{19}{2}(-12+78)=627)। ऋणात्मक से शुरू होने वाली श्रेणी में भी वही सूत्र लगता है।
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