(1024)n/5 × 4(2n+1)/ 16n× 4(n- 1) ⇒ (4⁵)n/5 × 4(2n+1) /42n × 4(n-1) ⇒ 4(n+2n+1)/4(2n+n- 1) ⇒ 4(3n+1)/(4(3n- 1) ⇒ 4(3n+1-3n+1) ⇒ 4² = 16
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