Question

Consider the number 7", where 'n' is a natural number and
n#1. What is the least value of 'n' for which 7n ends with
7in its units place. Give reason.

Answer 1

Answer:

least value of n=11

since 7*11=77 and in 77, 7 is in the units place. thus 11 is the answer.

thanks hope I could help