(1+1/51)+(3+3/51)+(5+5/51)+(7+7/51)+.+(97+97/51)+(99+99/51)
=(1+3+5+..+99)+(1+3+..+99)/51
=52/51(1+3+..+99)
=52/51×(1+99)×50/2
=52/51×2500
=130000/51
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