Question
Which of the following waves require a medium to
travel? ÂSolution
Sound waves are mechanical waves, which require a medium (such as air, water, or solids) to travel.  They cannot propagate in a vacuum.  On the other hand, electromagnetic waves (like light, radio waves, and microwaves) do not require a medium and can travel through space.
16, 32, 68, 132, ?, 376
3, 5, 12, 38, 154, ?
12, 25, 51, ?, 207, 415Â
16, 9, ?, 114.25, 750.625, 6396.3125
What will come in place of the question mark (?) in the following number series?
180, 184, 168, 204, ?, 240
12    48      192      ?      3072       12288
...Find the missing character.
What will come in place of the question mark (?) in the following series?
10, 11, 15, 31, 95, ?
- What will come in place of the question mark (?) in the following series?
121, 115, 102, 82, 55, ? 15   8   9   15   32    ?    250.5
