The sequence \( a_{1}, a_{2}, a_{3}, \ldots \ldots . a_{98} \) satisfies the relation \( a_{n+1}...

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The sequence \( a_{1}, a_{2}, a_{3}, \ldots \ldots . a_{98} \) satisfies the relation \( a_{n+1}=a_{n}+1 \) for \( n=1,2,3, \ldots \ldots .97 \) and has
PV the sum equal to 4949 . Evaluate \( \sum_{\mathrm{k}=1}^{49} \mathrm{a}_{2 \mathrm{k}} \).
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