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Grade: 10

                        

1/a1+1/a2+1/a3..........1/an are in AP ------------------------------------------------- find the value of ------------------------------------------------ a1a2+a2a3+a3a4+...............+.an-1.an

7 years ago

Answers : (1)

neeraj agarwal
34 Points
							

substract all from given question make pairs of what it want and you know aN-a(N-1)=d.solve it...............

7 years ago
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