There are 53 = 125 of them.
111, 112, 113, 114, 115, 121 etc.
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6 2-digit numbers (13/15/35/53/51/31)
10 + 15 = 25. the tens digit of 25 is 2
In the number 15, the digit 5 holds a place value of 5 units. This means that the digit 5 represents 5 ones in the number 15. The value of the digit 5 in this case is 5.
3.872983346207416885179265399782 The 30th digit is 2.
It is: 1