self Maths Puzzle Numerical Ability Sequence and Series

Find the ratio between the 4th and 8th terms of the sequence defined by a(n)=(-1)n n3?

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self Other Question

How many 3-digit numbers can be formed with the digits 1,4,7,8 and 9 if the digits are not repeated? 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.