Tentukan suku ke 50 dan jumlah suku ke 25 dari barisan ariematika 7,13,19,25,31,37​

Jawabannya adalah

7, 13, 19, 25, 31, 37,..

a = 7

b = 6

U50 = a + 49b

U50 = 7 + 49(6)

U50 = 7 + 294

U50 = 301

S25 = 25/2 (2(7) + 24(6))

S25 = 25/2 (14 + 144)

S25 = 25/2 (158)

S25 = 25(79)

S25 = 1975

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7, 13, 19, 25, 31, 37,..

a = 7

b = 6

U50 = a + 49b

U50 = 7 + 49(6)

U50 = 7 + 294

U50 = 301

S25 = 25/2 (2(7) + 24(6))

S25 = 25/2 (14 + 144)

S25 = 25/2 (158)

S25 = 25(79)

S25 = 1975