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The 10th term of an arithmetic progression is _27 and 5th term is _12 ,what is the 18th term ?find also the sum of its 25 term

3 answers

a + 9d = 27

a + 4d = 12

subtracting equations ... 5d = 15

solve for d , then substitute back to find a

Adjust as necessary if you really meant -27 and -12

Art

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