CBSE Class 10 Answered
if an=45,a=3,Sn=300,find d and n
Asked by | 31 Jan, 2009, 11:43: AM
Expert Answer
an = a + (n-1) d
Sn = (n/2)(2a + (n-1) d)
We have, an = 45, a =3, Sn =300
On substitution
45 = 3 + (n-1) d
42 = (n-1) d.................(1)
300 = (n/2) (6+ (n-1)d)
600 = n (6+42)
n = 600/48....................(2)
Now from (1) and (2)
Calculate d & n
Answered by | 31 Jan, 2009, 01:02: PM
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