Question
Complete the given series by replacing β?β
1276, 638, 638, 322, 319, 164, 159.5, β?βSolution
The series follows two alternating operations: Β Divide by 2: 1276 / 2 = 638; 638 / 2 = 319; 319 / 2 = 159.5 Subtract 0, then 2, then 4...: 638 - 0 = 638; 322 - 3 = 319? Let's find the correct pattern. A clearer pattern is: Γ·2, -0, Γ·2, -3, Γ·2, -5, Γ·2,... 638 (from 1276/2), then 638 (638-0), then 322 (638/2), then 319 (322-3), then 164 (638/2? Wait, 319/2=159.5, not 164). Let's check the numbers: 638 to 322 is Γ·1.98? It's Γ·2 exactly: 638/2=319, but it's written 322. There might be a misprint, but based on the (official) answer key, the next term is 85. 159.5 / 2 = 79.75, but that's not an option. The pattern might be alternating subtraction: 638 - 638=0, 638 - 322=316, not consistent. The intended pattern seems to be: Divide by 2, then repeat the number, then subtract 16? The correct logic based on the answer is that 164 is half of 328, but 319 is not 328. The most reliable way is to see that the last operation was dividing 319 by 2 to get 159.5. The next step should be to subtract a number from 159.5. 159.5 - ? = 85 (from answer key). 159.5 - 85 = 74.5, which doesn't fit a pattern. Given the answer is 85, and 164/2 = 82, but 82 is option (1). So the pattern is not straightforward. However, the answer key confirms (2) 85.
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