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U5 = a + 5n = 4

U7 = a + 7n = 10

Therefore 2n = 6 and so n = 3

and then a = 4 - 5n = 4 - 15 = -11

So Un = -11 + 3n

and therefore,

U10 = a + 10n = -11 + 10*3 = -11 + 30 = 19

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Q: What is the 10th term in an arithmetic sequence whose 5th term is 4 and 7th term is 10?
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