find the number of terms in A.P .18'15'12'_____,-48 and also find the sum of all its terms
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l = -48
d = - 3
a = 18
l = a + (n-1)d
-48 = 18 -3n + 3
3n = 48 + 18 + 3
3n = 69
n = 23
S = n/2 (a + l)
S = 23/2 (18 -48)
S = 23/2 * - 30
S = 345
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