In this video Natwar Mishra sir has explained a question from ARIHANT previous year solved questions on JEE MAINS.
Q. If 𝒂𝟏, 𝒂𝟐, 𝒂𝟑…. 𝒂𝒏 are in AP and if 𝒂𝟏+ 𝒂𝟒+ 𝒂𝟕……….+ 𝒂𝟏𝟔=114, then 𝒂𝟏+ 𝒂𝟔+ 𝒂𝟏𝟏+ 𝒂𝟏𝟔 is equal to
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https://www.youtube.com/watch?v=cI6GEM3UYXU