Question

কয়টি 4অংক /5 অংক/ 6 অংকের সংখ্যা আছে?​

Answer 1

In this situation there are 9,000 four digit numbers. If a four digit number is any string of four characters from 0-9 (so that 0001 and 0000 are four digit numbers) then we can reason as follows. Regardless of what number you chose for the first digit, there are 10 possible choices for the second digit.

The largest 5 digit number is 99999. 99999 minus 10000 is 89999, but since you have a zero-based count, you have to add 1. That means there are a total of 90,000 different 5 digit numbers.

there are 900000 six digit number

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