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The 3rd and 12th terms of an arithmetic progression are 12 and -24 respectively. What is the 50th term?

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a+2d=12
a+11d=-24
subtract them
9d = -36
d = -4
then a-8=12
a=20

term(50) = a+49d
= ...

what is the product of 23 and 45.

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