How many 4-digit positive integral numbers are there in base 7, if you are count

Question

How many 4-digit positive integral numbers are there in base 7, if you are counting the numbers in the same base system?

Options:

A . 2058

B . 5666

C . 6000

D . None of these

Answer: Option A
:
A
No. of 4-digit numbers in base 7 = 6

\times

\times

\times

7 = 2058.

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