If Sn=3n2+n find the a.p

Asked by  | 27th Oct, 2012, 09:02: AM

Expert Answer:

Answer : Given : Sn=3n2+n
To find : the AP
 
S1 = 3 +2 = 5 Therefore t1 = 5

S2 = 3*22 +2*2 = 12 +4 = 16 

d = 16 - 5 = 11

So AP is 5, 11 , 17 , 23, ... Answer

tn = a + (n-1)d

= 5 + (n-1) 6

= 6n -1

Answered by  | 27th Oct, 2012, 07:30: PM

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