Look at the series of numbers given in the riddle and find the connection between them.

Find value of ?? in the following sequence.

## 16, 06, 68, 88, ??, 98

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The ans is 78. Following the logic without tempering with the format, u can establish that, the difference between 16-06 is (-10), that of 68-88 is (+20), that of 88-78 which is my answer is (-10) and that of 78-98 is (+20). Hence with the answer as 78, the logic is -10, +20, -10, +20. Now that is logic.

if you rerason by inverting the numbers you get L8 which is 87 upside down and L8 is not a number. As Thomas says it is a spatial reasoning test not an algebraic one and the ansis actually 87. you look at the sequence from its bottom – but you should look at it from its top. Imagine the numbers are written on a floor then walk round them!

No it isn’t. It’s 87 upside down, which isn’t a number. The whole point is that the answer is not algebraic but a spatial reasoning test.