Question

Sum of the first 20 terms of an AP is -240, and its first term is 7. Find its 24 th term.

Answer 1

Step-by-step explanation:

$Sn = \frac{n}{2} (2a + (n - 1)d) \\ - 240 = \frac{20}{2} (2 \times 7 + (20 - 1)d) \\ - 240 = 10(14 + 19d) \\ \frac{ - 240}{10} = 14 + 19d \\ - 24 - 14 = 19d \\ \frac{ - 38}{19} = d \\ - 2 = d \\ \\ Tn = a + (n + 1)d \\ T24 = 7 + (24 - 1) - 2 \\ = 7 + (23) - 2 \\ = 7 + ( - 46) \\ = 7 - 46 \\ = - 39$

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Answer 2

Answer:

your answer is -39 dear

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