16. 196 : 169 : : 81 : ?
(a) 64
(b) 72
(c) 100
(d) 144
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Answer:
(a) 64
Step-by-step explanation:
196 = 14^2
169 = 13^2
likewise
81 = 9^2
So, next one will be 8^2 = 64
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