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What is the 31st term of the arithmetic progression −13, −11/2, 2, …?समान्तर श्रेणी −13, −11/2, 2, … का 31वाँ पद क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 212212
The common difference is d = −11/2 − (−13) = 15/2. Using aₙ = a₁ + (n − 1)d, a₃₁ = −13 + 30(15/2) = −13 + 225 = 212.सार्व अंतर d = −11/2 − (−13) = 15/2 है। सूत्र aₙ = a₁ + (n − 1)d से, a₃₁ = −13 + 30(15/2) = −13 + 225 = 212।
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