11. If 18, a, b, - 3 are in A.P., then find a + b.
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Answered by
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D=a-18
Also d= -3-b
On equating both the equations
We get,
a-18=-3-b
a+b=-3+18
a+b=15
Also d= -3-b
On equating both the equations
We get,
a-18=-3-b
a+b=-3+18
a+b=15
Answered by
0
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