Answers

2015-08-07T19:25:57+05:30
An = 50
a = 5

So, n = 50/5 = 10

But Sn is not possible to calculate as S is not given
0
2015-08-07T19:34:01+05:30
Ur question is incorrect

is it an or a^n
1 5 1
a=5, d=3, an=50 find n and sn
Ans = an= a+(n-1)d,, 50= 5+(n-1)3,, (n-1)3=50-5=45,, n-1= 45/3= 15,, n=15+1=16,,,, then n=16
sn= n/2(2a+(n-1)d),,, 16/2(2*5+(16-1)3),,, 8(10+15)3,,, 8(10+45),,,,, 8*45=440,,,,, n--16, and sn=440
ohk