self Maths Puzzle

If 7 times the 7th term of an A.P is equal to 11 times its eleventh term, find the 18th term of the A.P.

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self Other Question

Find the ratio between the 4th and 8th terms of the sequence defined by a(n)=(-1)n n3? If
6 / 7 = 2
3 / 9 = 7
8 / 2 = 6
Then
4 / 5 = ?