2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?

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2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?
2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?

2,3,6,9,17,( ) ..a:33 b:27 c:45 d:19..选那个?
2,3,6,9,17,(45 )

2, 3, 6, 9, 17, ( ) a.33 b.27 c.45 d.19 看差为１，３，３，８ 8=(3+1)*(3-1) x=(3+1)(8-1)=28 28+17=45