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U1 = 2
U6-U3 = 24
ditanya : a. b ?
b. Sn ?
jawab :
a. U6-U3 = 24 ---------------> a+5b - a+2b = 24
7b = 24
b = 24/3
b Sn ----> Sn = 1/2 n (2a + (n-1)b)
S50= 50/2 ( 2 (2) + (50-1) 24/3
= 25 (4+392)
= 25 (396)
= 9900