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Verified answer
2,8,14,20,26,32,38,44,50,56 = 290》2, 8, 14, 20, 26
Ditanya Jumlah 10 suku pertama (S10)
Dengan beda (b) :
U2 = a + b = 8
U3 = a + b = 14
------------- -
》-b =-6
》 b = 6
Sn = n/2 (2a+(n-1) (b))
》S10 = 10/2 (2(2) + (10-1) (6))
》 S10 = 5 (4 + (9) (6))
》 S10 = 5 (4 + 54)
》 S10 = 5 (58)
》 S10 = 290
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