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10 = a+2b.... ( pers 1)
U7 = a + 6b = 22
22 = a+6b... ( pers. 2)
pers 1 dan 2
10 = a+2b
22 = a+6b
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- 12 = - 4b, maka b = 3
10 = a+2b
10 = a+2( 3)
10 = a+ 6, maka a = 10 - 6 = 4
Sn = n/2 ( 2a + ( n - 1) b )
S30 = 30/2 (2 . 4 + ( 30 - 1) 3)
S30 = 15 ( 8 + 29.3)
S30 = 1425