WebHow many terms of the A.P: 24,21,18,.... must be taken so that their sum is 78? Medium Solution Verified by Toppr ⇒S n= 2n[2a+(n−1)d] ⇒78= 2n(2a+(n−1)d) ⇒78= 2n(2(24)+(n+1)(−3)) ⇒156=n(48−3n+3) ⇒156=n(51−3n) ⇒156=51n−3n 2 ⇒3n 2−51n+156=0 ⇒3n 2−12n−39n+156=0 ⇒3n(n−4)−3q(n−4)=0 ⇒n=4 or n= 339=13 Solve … Web3 apr. 2024 · First term (t 1) = a = 3, Common difference (d) = 8 – 3 = 5 and last term (t n) = 78 The general term of A.P is t n = a + (n - 1) d 78 = 3 + (n – 1)5 ⇒ 78 = 3 + 5n – 5 ⇒ 78 = - 2 + 5n ⇒ 78 + 2 = 5n ⇒ 80 = 5n ⇒ n = 16 ∴ 78 is 16th term of A.P: 3, 8,13, 18,... Download Solution PDF Share on Whatsapp Latest SSC CGL Updates Last updated on Apr 3, 2024
Consider the following AP:24,21,18 ……How many terms of this AP …
WebExample: Find the sum of the first 20 terms of the arithmetic series if a 1 = 5 and a 20 = 62. Solution: Here, a 1 = 5 and a 20 = 62 and n = 20. If we have given the first term and the … WebWhite House press corps. The White House press corps is the group of journalists, correspondents, and members of the media usually assigned to the White House in … dick\u0027s sporting goods boulder co
How many terms of the A.P - 6, - 11/2, - 5 .......are needed to give ...
Web10 jul. 2024 · Click here 👆 to get an answer to your question ️ Howmanydermsmustofthe AP: 24, 21, 18....must be taken so that their sum is 78? shafiya15 shafiya15 10.07.2024 Math Secondary School answered How many derms must of the AP: 24, 21, 18.... must be taken so that their sum is 78? 1 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. WebEasy Solution Verified by Toppr Given, a=−6 d=− 211−(−6)= 21 Formula, S n= 2n[2a+(n−1)d] −25= 2n[2(−6)+(n−1) 21] −50=n[ 2−24+n−1] n 2−25n+100=0 (n−20)(n−5)=0 ∴n=5,20 Therefore the number of terms required is 5 or 20 Solve any question of Arithmetic Progression with:- Patterns of problems > Was this answer helpful? 0 0 Similar questions city breaks for teens