Question

How many 5 digit numbers are possible from digits 1, 2, 3, 4, 5, 6, 7. When repetition of digits is allowed ?

• A. $7^4$
• B. $5^7$
• C. $7^5$
• D. None of these

Answer 1

The correct option is C $7^5$

$(7{)}^5\Rightarrow 7\times 7\times 7\times 7\times 7=7^5$