$$(0.6)^{4} \times (0.36)^{2} \times (0.216) = (0.6)^{(?)}$$
$$(0.6)^{4}$$ * $$(0.6*0.6)^{2}$$ * (0.6*0.6*0.6)
$$(0.6)^{4}$$ * $$(0.6^{2})^{2}$$ * $$(0.6^{3})$$
$$(0.6)^{4+4+3}$$
$$(0.6)^{11}$$
Hence , x = 11
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