Question

What percentage of numbers from 1 to 70 has 1 or 9 in the unit's digit?

Answer 1

20percent of no from 1 to 70 has 1/9 in its unit place

Answer 2

What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit? Explanation: Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.