6, 12, 21, ?, 48

Find the missing number / letters / word from the given alternative: AYBZC, DWEXF, GUHVI, JSKTL, ?

Choose the missing terms out of the given alternatives : P E R P E N D I C U L A R, E R P E N D I C L A , R P E N D I C …

120, 99, 80, 63, 48, ?

8, 9, 8, 7, 10, 9, 6, 11, 10, ?, 12

589654237, 89654237, 8965423, 965423, ?

Choose the missing terms out of the given alternatives : 2B, 4C, 8E, 14H, ?

Choose the missing terms out of the given alternatives : AZY, BUT, CXW, DWV, ?

4, 10, ?, 82, 244, 730