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Find the indicated terms in each of the following arithmetic progression:a = 21, d = -5; tn, t25 |
Answer» Given: a = 21 , d = –5 To find: tn and t25 We have, tn = a + (n – 1)d tn = 21 + (n – 1)(–5) = 21 – 5n + 5 tn = 26 – 5n Now, n = 25 So, t25 = 21 + (25 – 1)(–5) = 21 + 24 × (–5) t25 = 21 – 120 t25 = –99 |
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