କେଉଁ ସଂଖ୍ୟା ନିମ୍ନ କ୍ରମରେ ପ୍ରଶ୍ନ ଚିହ୍ନ (?) କୁ ବଦଳାଇବ?

18, 20,?, 128, 514, 2572

1
42
2
40
3
22
4
80

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