Question

Find the number which does not belong to the sequence 7,15,31,68,127​

Answer 1

Step-by-step explanation:

7. 15. 31. 63. 127

×2+1. ×2+1. ×2+1. ×2+1

So, in the given sequence 7,15,31,68,127

The number '68' will be displaced to be '63'

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Answer 2

The number which does not belong to the given sequence = 68

Step-by-step explanation:

The given sequence:

7, 15, 31, 68, 127​

To find, the number which does not belong to the given sequence =

The pattern follow:

Previous number × 2 + 1, Previous number × 2 + 1, Previous number × 2 + 1, ....

15 = 7 × 2 + 1 = 14 + 1 = 15

31 = 15 × 2 + 1 = 30 + 1 = 31

68 = 31 × 2 + 1 = 62 + 1 = 63 ≠ 68

127 = 63 × 2 + 1 = 126 + 1 = 127

∴ The number which does not belong to the given sequence = 68

Thus, the number which does not belong to the given sequence is 68.