UPSKILL MATH PLUS

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1. Two APs have the same common difference. The first term of one of these is \(–1\) and that of the other is \(– 8\). Then the difference between their \(4^{th}\) terms is
 
2. If \(7\) times the \(7^{th}\) term of an AP is equal to \(11\) times its \(11^{th}\) term, then its \(18^{th}\) term will be