Answer:
2553(base 7) = 969(base 10)
Explanation:
3 in units place means 3.
5 in the 7's place means 5 × 7 = 35
5 in the 7²'s place means 5 × 7² = 5 × 49 = 245
2 in the 7³'s place means 2 × 7³ = 2 × 343 = 686
3 + 35 + 245 + 686 = 969
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