If the numbers 2 and -1, 3 and + 2 and 6 a.m. - 1 are in AP then find and and hence find the numbers

If the numbers 2 and -1, 3 and + 2 and 6 a.m. - 1 are in AP then find

1.	If the numbers 2 and -1, 3 and + 2 and 6 a.m. - 1 are in AP then find and and hence find the numbers
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