Question

How many square numbers are there in the above number series?
64. 15, 75, 36, 19, 25, 86, 81, 100.
(1) Four
(2) Five
(3) Three
(4) Six
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Answer 1

Step-by-step explanation:

I think six square numbers

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Answer 2

$64 = {4}^{2} \\ 15 = {?} \\ 75 = {?} \\ 36 = {6}^{2} \\ 19 = {?} \\ 25 = {5}^{2} \\ 86 = {?} \\ 81 = {9}^{2} \\ 100 = {10}^{2} \\ \huge \boxed{5 \: square \: roots}$