Web4 jan. 2024 · Given : AP = 24,21.. Sn = 78 . To find : n = ? AP = 24, 21 , 18 .. So, First term of AP = (a) = 24, common difference (d) = (21 - 24) = -3. Let n no. of terms to be taken, So that sum = 78. So, sum of n terms of the AP, Sn = n/2 × [2a + (n-1)d] Substituting the given value in above formula we get, = n/2 × (2 x 24 + (n-1) × (-3) ∴ n/2 × ... WebLet the number of terms taken be n. THe given A.P is 24, 21, 18, ..... Here a = 24 and d = 21 - 24= -3 `S = n/2[2a + (n - 1)d]` `=> 78 = n/2 [2 xx 24 + (n - 1)xx (-3)]`
How many terms of the A.P. 24, 21, 18, - Shaalaa.com
Web18 jun. 2016 · The simplest arithmetic progression satisfying the given condition is the constant progression with all $45$ terms equal to $18.$ The sum of that progression is … Web11 apr. 2024 · Complete step-by-step answer: The given A.P is 24, 21, 18,................... So the first term (a) of the A.P is = 24. And the common difference (d) of the A.P is ⇒ d = ( … earth day ideas 2023
Ex 5.3, 4 - How many terms of AP 9, 17, 25 … must be - Ex 5.3
Web25 short stories in several genres, all in the Life + 70 public domain, gathered from newspapers and magazines and in many cases republished here for the ... 18: The … WebConsider the following AP: 24, 21, 18..... How many terms of this AP must be taken so that their sum is 78? [4 MARKS] Solution Formula: 1 Mark Concept: 1 Mark Application: 2 … WebAn AP consists of 50 terms of which 3rd term is 12 and the last term is 106. Find the 29th term. 6. Find the 10th term of the AP: 2, 7, 12, … 7. Find the 6th term from the end of the AP: 17, 14, 11, …, –40. 8. Which term of the AP: 21, 18, 15, … is zero? 9. Write the next term of the AP: 8 1 , , 8 32 , ……….. 10. earth day ideas for businesses