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u2 - a = u3 - u2
( k + 3 ) - (k-3) = 3k - (k + 3)
K + 3 - K +3 = 3k - k - 3
6 = 2k - 3
2k =
K = 9/2= 4,5
barisannya :
K- 3 = 4,5- 3 = 1,5
K + 3 = 4,5 + 3 = 7,5
3k = 3 *4,5 = 13,5
1,5, 7,5, 13,5
c. 2K + 3 - (k+2) = 5k - ( 2k + 3)
2k + 3 - k - 2 = 5k - 2k - 3
k + 1 = 3k - 3
4 = 2k
K = 2
urutannya : K = 2
4, 7 , 10