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b <- 3----4---5
c <- 1---1
U17 = a + (n-1)b + 1/2 (n-1) (n-2) c
= 2 + (17-1)3 + 1/2 (17-1) (17-2)1
= 2 + 16 × 3 + 1/2 ×16 × 15 × 1
= 2 + 48 + 120
= 170 (c)