the value of a and b such that 18,a,b,-3 are in a.p. is:
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a = 18
n = 4
an = a +(n-1)d
-3 = 18 + (4-1)d
-3= 18 +3d
3d = -3 -18
d = -21/3
= -7
so,
a = 18 + (-7)
= 18 -7
= 11
b = 11 + (-7)
= 11 -7
= 3
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