AP

Asked by monikas | 7th Oct, 2008, 02:33: PM

Expert Answer:

Sn = 5 n 2  -  3n

a1  =  S1 = 5(1) - 3 (1) = 2

S2  =  5(4) - 3(2)= 14  = a1  +  a2

a2 = (a1  +  a2)  -  a1   = 14 - 2 = 12

d = 12 - 2 = 10

a10  =  a1  +  9 d  = 2 + 9(10) =  92

Answered by  | 7th Oct, 2008, 06:05: PM

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