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20 16 math problems in the first day of junior high school
Law: left = n+(n-1); Right = n 2-(n-1) 2, where n is the nth expression.

( 1)n= 10

10+( 10- 1)= 19

19= 10^2-9^2

(2)n+(n- 1)=n^2-(n- 1)^2

2n- 1=n^2-(n- 1)^2

(3)a+(a- 1)=20 15

2a- 1=20 15

2a=20 16

a= 1008

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