2 is the ODD term in the sequence, and since there are 50 of them, the sum of the ODD terms (Terms 1,3,5,7,9, etc.) is 100 (50 * 2)

The EVEN terms (Terms 2,4,6,8,10, etc.) starts with 5 and since there are 50 of them, we use the following formula for the sum of an AP:  

 ------ Substituting 50 for n (number of terms), , and 4 for d (common difference)



Sum of 1st 100 terms of sequence:  

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