If 436 = 3, 783 = 8 and 654 = 5, then 896 = ?

QuestionIf 436 = 3, 783 = 8 and 654 = 5, then 896 = ?
Typemultiple_choice
Option5incorrect
Option8incorrect
Option13correct
Option6incorrect
Solution(4+3+6)-10=3
(7+8+3)-10=8
(6+5+4)-10=5
(8+9+6)-10=13
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