Page 24 - Math Grade 11 (Advance)

PROEUS DARA

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rutmnf!U
u
0 1 C» ";:: Q1
nrl.fH'i~9 n tSft]fi (a ) '1
11
1

3 3
sll = n + 2n ==? sn-1 = (n- 1) + 2(n- 1)
3 3
an= Sn-Sn-l = n +2n-(n-1) -2(n-l)
3 3 2 2
= n +2n-2n+2-n +3n -3n+I =3n -3n+3
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2
,
~9 n &Sft]fi (an) ?'i a = 3n -3n+3
11
1
1 0 , ""
&?'i'i::flS S = 4-a --(n= l 2, 3, ... ) dltHlitin n fif:!tibtShlfi (a ) '1
n 11 n - 2 · ' U U U ~ 11
2
n. fiM~gSlfigstJfitnfls~tlb an+I Sb an '1
0 I QJ '3 Ql
~. n rulfi~9 n tS fl]fi (an) '1
1
3.

an+Z = 3a + 1 -2a 11 (n =I, 2, ... ) '1
11

a = 3 · a - 2 · a = 9-2 = 7
2
3
1
a = 3 · a - 2 · a = 21 - 6 = 15
3
4
2
a = 3 · a - 2 · a = 93 - 30 = 63
6
4
5
?1M S1 d ru hlb fitS t\jms g
u ()
1

19