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For what value of kwillk+9,2k-1and 2k+7arecomposite …

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For what value of kwillk+9,2k-1and 2k+7arecomposite number
  • 1 answers

Sia ? 5 years, 6 months ago

We know that difference between any two consecutive terms of an AP is equal

{tex}\therefore{a_2} - {a_1} = {a_3} - {a_2}{/tex}

let {tex}a_1=(k+9), a_2=(2k-1), a_3=(2k+7){/tex}

{tex} \Rightarrow (2k - 1) - (k + 9) = (2k + 7) - (2k - 1){/tex}

{tex} \Rightarrow k - 10 = 8{/tex}

{tex} \Rightarrow k = 18{/tex}

http://mycbseguide.com/examin8/

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