The number of columns in the order of law is: - 1,3, - 5,7, - 9, 11. According to this rule, what is the 20th number in this column and what is the nth number What's the 20th book in this column
Sequence formula: (2n-1) Cosn π n is a positive integer, PI represents
The twentieth is - 39
Nth: if n is even, then - (2n-1); if n is odd, then (2n-1)