Series : Sum of Squared Types ∑r² : ExamSolutions Maths Made Easy

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Notice that sir mentions about another certain tutorial at 6:57, 6:58 to 7:05 where sir explained that particular part of sigma notation in a greater detail...Can anybody provide links of that tutorial ?? It'd of great help...TIA

rafiatbinmorshed
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may you show some examples about sigma and common factor?
thank you very much anyways

guestone
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The answer to question 3) is 1640, not 2200?? Can you please confirm for me if I'm right or wrong

MrMoeqt