Do you know its Property-3

Algebra Level 5

an a_n is the nth term of an increasing arithmetic progression. If r=140001arar+1=10\sum_{r=1}^{4000}\frac{1}{a_r a_{r+1}}=10 and a2001=25a_{2001}=25, what is the value of a1a4001 |a_1-a_{4001}|?

You can try more such problems of the set Do you know its property ?

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