SEQUENCE, 3,9,27,81,243, 5,10,15,20,25, 10,20,30,40,50,60, 10,5,5/2,5/4,5/8,5/16, SERIES, 2+4+6+8+10, a+(a+d)+(a+2d)+(a+3d)+(a+4d), 1+2+4+8+16, ar+ar2+ar3+ar4+ar5

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