Answer :

For a series to be in AP, the common difference (d) should be

Equal.


D1 = second term – first term = -3.2 – (-1.2) = -2


D2 = Third term - Second term = -5.2 – (-3.2) = -2


Since common difference is equal the above series is in AP


The next three terms will be the 5th, 6th, 7th.


5th term will be given by


= a + (5-1)d = a + 4d = -1.2 + 4(-2) = -9.2


6th term is a + (6-1)d = a + 5d = -1.2 + 5(-2) = -11.2


7th term is a + (7-1)d = a + 6d = -1.2 + 6(-2) = -13.2


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