self Maths Puzzle

A teacher thinks of two consecutive numbers between 1 and 10. The first student knows one number and the second student knows the second number. The following exchange takes place:
First: I do not know your number.
Second: Neither do I know your number.
First: Now I know.
What are the 4 solutions of this easy number puzzle?

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self Other Question

In How many ways 3 different rings can be worn in 5 fingers?
A. 27
B. 60
C. 125
D. 210
Fill in the blank
56% of 112 = 112% of .........