MatHs diFFicULT QUeStiOns

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hey all,

kindly post some difficult questions of maths here so that we all can practice 'em and please mention that whether they r off paper2 or paper1

if someone need any help s/he can post it too :) :)
 
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b(i) there is a common difference of 4 so 4n+6
b(ii) its a quadratic equation.. (n^2)+n
 
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