If 16 = 11, 25 = 12, 36 = 15, then 49 = ?
A19
B20
C25
D21
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ഒരു പ്രത്യേക ഭാഷയിൽ TEACHER ന്റെ കോഡ് WHDFKHU എങ്കിൽ STUDENT ന്റെ കോഡ് എന്ത് ?
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