if 18 ,a,b, -3 are in a.p then a+ b
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Answer:
a=18
t4=a+(n-1)d
-3=18+3d
-3-18=3d
-21=3d
d=-21÷3
d=-7
a=18+-7
a=11
b=11+a=11+-7=4
a+b=11+4
=15
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