To find the next number in the series 9,265,393,457,489, we need to identify the pattern. Analyzing the differences between consecutive numbers:

265 - 9 = 256
393 - 265 = 128
457 - 393 = 64
489 - 457 = 32

Each difference is half of the previous difference. Following this pattern, the next difference should be 32 / 2 = 16.

Therefore, the next number in the series is: 489 + 16 = 505

The correct answer is B) 505.

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