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নিচের চিত্রে f:A→B এবং g:B→C হলে কোন উত্তরটি সঠিক?
(gof)(1)≠ (gof)(3)
(gof)(1)=(gof)(3)
(gof)(2)≠(gof)(3)
(gof)(2)=(gof)(3)
ANS : 2
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