যদি 16 # 8 * 15 = 17, 21 # 3 * 9 = 16, এবং 14 # 2 * 8 = 15 হয়, তাহলে 15 # 5 * 13 এর মান কত হবে?

1
15
2
16
3
12
4
18

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