\(\left(\dfrac{1}{3}\right)^{2017}.3^{2016}.21\)
=\(\left(\dfrac{1}{3}\right)^{2017}.3^{2016}.3.7\)
=\(\left(\dfrac{1}{3}\right)^{2017}.3^{2017}.7\)
=\(\left(\dfrac{1}{3}.3\right)^{2017}.7\)
=\(1.7=7\)
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