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Mathematics
OpenStudy (anonymous):

\[\sum_{51}^{77} 2i-1\]

OpenStudy (anonymous):

whats the process of getting the answer though?

OpenStudy (experimentx):

\[ 2\sum_{55}^{77}i - (77-51) \] ^ this is an Arithmetic sequence with first term 55 and common difference 1

OpenStudy (anonymous):

so all i do now is subtract 77-51?

OpenStudy (experimentx):

\[ 2 \times 55(77-51)(77-51+1)/2 - (77-55)\]

OpenStudy (anonymous):

|dw:1338098017386:dw| that was how i was solving it and my answer was 3328 but it was wrong?

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