Question

(i) Check whether (20)" can end with the digit 5
for any natural number n.​

Answer 1

Answer:

To end with the digit 5 any number should be in the form of either 5^m x 3^n or 5^m x 7^n ( Where m and n are whole numbers ). But here it is not so. Hence 20ⁿ can't end with 0.