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-1 is the answer okkkkkk
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Step-by-step explanation:
Step 01:- R1 --->R1+R3
step 02:- It is in A.P so 2b = a+c so put it
Then you will get that R1 and R2 are proportional since , from property of ∆ , ∆ = 0
_Solution is in given attachment __
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