* 3. The sum of how many terms of the AP-15, -13, -11, ... is - 55 ?� – InterviewSolution

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* 3. The sum of how many terms of the AP-15, -13, -11, ... is - 55 ?

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Step-by-step EXPLANATION:

the SUM of the TERMS

$- 15 - 13 - 11 - 9 - 7$

$- 28 - 20 - 7$

$- 48 - 7$

$- 55$

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