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1a=3+21a=13+2= 3+23+23-2=3-23-2a+1a-3+2+3-2=3+2+3-2=23

এখন , a3+1a3=a+1a3-3.a.1aa+1a=233-323a+1a=23=23.33-3×23=8.33-63= 243-63=183

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