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Maths, Addmaths and Statistics: Post your doubts here!

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The trial and error isn't working here. ^^
Ok i finally got it.In such complex patterns there is always a hint given in the above sequence and we have to make a relation with the one above and the one we have to find,this is a rule.So here we can see that each number below is increased by n and +1 e.g 2nd was 3 in first pattern but in next it was 3+2(number of sequence) + 1 and so on.Hence we can insert this in the formula given above to derive it.Final formula would be

(n+1)(n+2)/2

getting me?
 
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