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If the sequence is 1,4,10,19,31,......

Then the sequence formula is, 1 + 3/2n(n - 1)

Confirm 5th term....1 + (3/2 x 5 x 4) = 1 + 30 = 31

the 6th (next) term = 1 + (3/2 x 6 x 5) = 1 + 45 = 46

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