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Grade 12th passAlgebra

Please help me With 59 Question.please explain it clearly. Hope my doubt will be solved. Thanking for helping me.

Question image for Please help me With 59 Question.please explain it
Profile image of Dv nagaraju
7 Years agoGrade 12th pass
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1 Answer

Profile image of Saurabh Koranglekar
7 Years ago
Dear student

If you solve terms you will get a pattern

15+14+13........1
n*(n+1)/2
15*8
= 120

Regards

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