# If the sum of a c

To Find: Last term of the AP.

Let the number of terms be n.  n[54 - 3n + 3] = - 60

3n2 - 57n - 60 = 0 Either n = 20 or n = - 1 (n cannot be negative)

Therefore n = 20

Also, , where l is the last term. - 30 = 270 + 10l l = - 30

The last term is - 30.

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