If 1/(b – a) + 1/(b – c) = 1/a + 1/c, then a, b, c form a/an
Arithmetic progression
geometric progression
Harmonic progression
None of these
Correct Answer : C
Look at this series: 15, __, 27, 27, 39, 39,...What number should fill the blank?
Which pair of numbers comes next 13 29 15 26 17 23 19
Which pair of numbers comes next 7 9 66 12 14 66 17