निम्नलिखित प्रत्येक

Choose the number which is different from others in the group.

Find sum of first n terms: 2 + 6 + 12 + 20 + 30 + …

12       16       43       ?         184        220

If 18 x 10 42 -22,

Then, 50% of 2x - 25% of x = ?

Two numbers series are given below each follows a different pattern. Neither of the series contains any wrong term.

261      256       246       231      211      ?

Find the  wrong term  in the following series:

4, 14, 45, 142, 427, 1292

48     24     72     18      90      ?

840 400 180 ? 15 -12.5