2 x 4 + 4 x 6 + 6 x 8 ..... എന്ന പരമ്പരയുടെ 20-ാം പദം എത്ര ?
A1680
B1640
C1600
D1620
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(64)2 - (36)2 = 20 x ആയാൽ x=