20.5, 30, 40.5, 53, 64.5, 78
ATQ, 20.5 + 9.5 = 30 30 + 10.5 = 40.5 40.5 + 11.5 = 52 52 + 12.5 = 64.5 64.5 + 13.5 = 78 Therefore, 52 should come in place of 53.
71 81 61 101 51 181
420, 380, 340, 300, 280, 220, 180
21 32 54 86 131 186
7, 16, 33, 74, 153, 312
225, 45, 450, 90, 900, 150, 1800
3 4 18 72 360 2160
12, 28, 64, 128, 228, 379
12, 36, 41, 121, 128, 384
131, 212, 261, 286, 295, 299
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