15 ____ 3 ____ 4 ___ 5 = 25 ഇതിൽ ചേർക്കേണ്ട ശരിയായ ചിഹ്നങ്ങൾ ഏത് ?
A÷ , + , x
B- , + , x
C- , x , +
D÷ , + , -
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