Question

5,13,29,61,120,253 identify the wrong numbers

Answer 1

The wrong number in the series 5, 13, 29, 61, 120, 253 is 120

Solution:

Given series is 5, 13, 29, 61, 120, 253

We need to determine the wrong term in the series

When we find the difference of the successive numbers we get,

13 – 5 = 8

29 – 13 = 16

61 – 29 = 32

120 -61 = 59

253 – 120 = 133

From above, there is something wrong with 120

Now, we try with different pattern

Which is x 2 + 3

$\begin{array}{l}{5 \times 2+3=13} \\\\ {13 \times 2+3=29} \\\\ {29 \times 2+3=61} \\\\ {61 \times 2+3=125} \\\\ {125 \times 2+3=253}\end{array}$

Hence the wrong number is 120 and the correct number should be 125

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