The sum of first n terms of an AP.is 5n-2n². Find the AP.i.e. a and d.
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Sn = 5n-n^2
S1 = 4 =a1
S2=6 =a1+a2
a2= 6-4 =2
d=a2-a1=-2
AP= 4 ,2 ,0 ,-2 ,-4 ......
S1 = 4 =a1
S2=6 =a1+a2
a2= 6-4 =2
d=a2-a1=-2
AP= 4 ,2 ,0 ,-2 ,-4 ......
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