Saved Bookmarks
| 1. |
The first term of an AP is 5 and the last term is 45. The sum is 400. Find n and d. |
|
Answer» Answer: N = 16 d = 8/3 Step-by-step explanation: SN = n/2(a+an) 400=n/2(5+45) 400=n/2*50 400x2/50 = n n=16 Aftr this u PUT the formula... Sn= n/2(2a+n-1)d Hope HELPS u......... Keep trying |
|