Web22 mrt. 2024 · Transcript. Ex 9.2,13 If the sum of n terms of an A.P. is 3n2 + 5n and its mth term is 164, find the value of m. Let a1, a2, … an be the given A.P Given, Sum of n terms = 3n2 + 5n Sn = 3n2 + 5n Putting n = 1 in (1) S1 = 3 × 12 + 5 × 1 = 3 × 1 + 5 × 1 = 3 + 5 = 8 Sum of first 1 terms = First term ∴ First term = a1 = S1 = 8 Sn = 3n2 + 5n …(1) Putting … WebIt is surprising that an author as prolific, and as long-lived, as Fred Merrick White, has but one picture on the internet, and not a very good one, while another, as well known as …
Find the sum of first 20 terms of an A.P. whose nth term is given as …
Web11 nov. 2011 · Find the sum of first n terms if an AP whose nth term is 5n-1. Hence find the sum of first 20 terms. Asked by 11 Nov, 2011, 04:16: PM Expert Answer n th term … WebThe sum of the first n terms of an AP is (5n^2/2 + 3n/2). Find its nth term and the 20th term of this AP. asked Jul 9, 2024 in Arithmetic Progression by Anaswara ... The sum of … toab tourist
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Web13 jan. 2024 · Find the sum of first 15 terms of an A.P. whose nth term is 9 – 5n Advertisement Loved by our community 101 people found it helpful last term = 9-5n a+ … Web27 apr. 2015 · To find the nth term in arithmetic sequence we use the formula a n = a + ( n − 1) d we already know the values of n and d and so I substitute: a 15 = a + ( 15 − 1) ( 2) a 15 = a + 28 I'm stuck here... sequences-and-series Share Cite Follow edited Apr 21, 2024 at 16:31 asked Apr 27, 2015 at 7:01 direprobs 492 3 9 23 Add a comment 3 Answers Web22 aug. 2024 · Answer: Sum of 15 terms in given A.P Sum of 15 terms in given A.P= -465 Step-by-step explanation: Given ---- (1) Now , substitute n=1 in equation (1), we get i) … pennine bridleway map download