Calculation is beautiful

Algebra Level 3

a1,a2,a3,,a98a_1,a_2,a_3,\ldots, a_{98} are terms in an arithmetic progression with common difference 1 such that their sum is 137.

What is the sum of the even terms of this progression? That is, what is the value of a2+a4+a6++a98 a_2+a_4+a_6+\cdots+a_{98} ?

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