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Please help...

Given U3 = 0

S15 = -300

How can you find d? And U1?

(Instead of "T", we use "U" for "term", and d is the common difference)

Thanks!

Given U3 = 0

S15 = -300

How can you find d? And U1?

(Instead of "T", we use "U" for "term", and d is the common difference)

Thanks!

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