7) In an AP if Sn = 4n – n^2
then d is
A) 2 B) 1 C) - 2
D) - 1
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Answer:
s1 = 4(1)-1
s1=3
a=3
s2=8-16
s2=-8
a2=s2-a1
a2=-8-3
a2=-11
d=a2-a1
11-3
=8
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