Among the three fractions (8/15), (9/36) and (6/12), how many fractions cannot be reduced to finite decimals?
在(8/15)、(9/36)、(6/12)这三个分数中，不能化成有限小数的是多少．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<result>8/15 = around 0.533333</result>