Quant Quiz-Series

Direction (1-5) : In the following number series only one number is wrong. Find out the wrong number.

1. 1250, 1299, 1335, 1355, 1376, 1385, 1389
(1) 1355
(2) 1389
(3) 1250
(4) 1376
(5) 1335

2. 6840 , 3418, 1707, 851.5, 432.75, 209.875
(1) 3418
(2) 851.5
(3) 432.75
(4) 209.875
(5) 1707

3. 1340, 1333, 1319, 1300, 1270, 1235, 1193
(1) 1319
(2) 1270
(3)1333
(4) 1300
(5) 1193

4. 123, 248 , 498, 998,1990 ,3998 7998, 15998
(1) 248
(2) 998
(3) 3998
(4) 7998
(5) 1990

5. 32, 21, 15.5, 12.75,11.375, 10.75
(1) 11.375
(2) 15.5
(3) 21
(4) 10.75
(5) 12.75