ഒരു ജി.പി.യുടെ ആദ്യ പദം. 20 ആണ്, പൊതുഗുണിതം 4 ആണ്. അഞ്ചാമത്തെ പദം കണ്ടെത്തുക.
A5120
B5220
C5020
D5320
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