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u20 = 6(20)-4=116
s20 = 20/2 (2+116) = 1180 (b)
U1 /a = 6 x 1 - 4 = 2
U2 = 6 x 2 - 4 = 8
beda = 8 - 2 = 6
S20 = n/2 (2a + 19 x 6) = 20/2 (2 x 2 + 114)
= 1180