Question

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Answer 1

AP: 41,39,......and so on....


therefore, a= 41, d= 39-41= -2,an= 7,n=?

an=a+(n-1)d
7=41+(n-1)-2
7-41=(n-1)-2
-34/-2=(n-1)
17=n-1
17+1=n
18=n

therefore, number of lines of tress is 18..

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