In an A.P.,if Sn = n(4n+1) ,Find the A.P.
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Answered by
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sn=n(4n+1).
s1=5
5=1/2(2a)
5=1/a
5a=1
a=1/5
.....upto this crct...
after that....s2=18
18=2/2(1/5+an)
18=1/5+an
90=an+1
an=89
an =a+(n-1)d
89=1/5+88d
89*5=88d+1
445=88d+1
444=88d
88d=444
d=444/88
d=111/22
ap=a+d.... and so on ..
RiaMariaS:
not sure...if not ri8 sry
Answered by
0
Answer:
Step-by-step explanation:
☆ According to given question:
☆ let n be some positive integer 1,2,3,4
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