प्रयास और भूल सिद्धांत के � – McqOptions

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1.	प्रयास और भूल सिद्धांत के प्रतिपादक है -
A.	थॉर्नडाइक
B.	मैक्डूगल
C.	कोहलर
D.	पावलॉव
Answer» B. मैक्डूगल

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