If 18, a , b, -3 are in AP, then a+b =
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as 18, a, b, -3 are in a.p.
t1=18
t4=t1+(n-1)d
-3=18+3d
3d= -21
d= -7
a=t1+d
a=18-7=11
b=t2+d=a+d=11-7=4
a+b=11+4=15
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