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a = U1 = 5
b = 14-5 = 9
Dit. S20 ...?
Peny.
Sn = 1/2 n ( 2a + (n-1)b )
S20 = 1/2 × 20 ( 2×5 + (20-1)9 )
S20 = 10 ( 10 + 19(9) )
S20 = 10 (10 + 171)
S20 = 10(181)
S20 = 1.810
Semoga bermanfaat :)