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[" f20"quad " find the length of each ta...

[" f20"quad " find the length of each tangent."],[" places of "19." For the "AP-3,-7,-11,..." can we find "],[" directly "a_(30)-a_(20)" without actually finding "],[a_(30)" and "a_(20)?" Give reasons."],[" of "r=5]

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For the AP -3, -7, -11, … can we find directly a_(30)-a_(20) without actually finding a_(30) and a_(20) ? Give reason for your answer.

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