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If (x\in \mathbb{N}) and ( 2x-5<11 ), how many values of (x) are possible?

Answer and explanation

Correct answer: 7

Solve the inequality: \(2x-5<11\Rightarrow 2x<16\Rightarrow x<8\). Taking natural numbers as \(1,2,3,\ldots\), the possible values of \(x\) are \(1,2,3,4,5,6,7\). Hence, there are 7 values. The answer would be 8 only under the convention that 0 is included in natural numbers; this question uses the common school convention \(\mathbb{N}=\{1,2,3,\ldots\}\). Exam tip: After solving an inequality, count values according to the specified number set.

Related tags

Linear InequalitiesNatural NumbersOne VariableAlgebraic SolutionCounting SolutionsAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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