How many terms
of the arithmeric
Sequence to be added
to get 1375
Answers
Answered by
1
Step-by-step explanation:
= 9, d = 17 - 9 = 6
Sn = (n/2) [2a + (n - 1)d]
(n/2) [2(9) + (n - 1)8] = 636
(n/2) [18 + 8n - 8] = 636
(n/2) [10 + 8n] = 636
n[5 + 4n] = 636
5n + 4n2 = 636
4n2 + 5n - 636 = 0
4n2 - 48n + 53n - 636 = 0
4n(n - 12) + 53(n - 12) = 0
(n - 12) (4n + 53) = 0
n = 12
Answered by
3
Answer:
⤵️
use this formula and put the value
(n+2d),(n+3d)........and so on...
l hope it's help you..✨♥️✨
Similar questions