Series

Andrew wrote this series of numbers: 1,3,7,15, .... n. Which number from the set 2047, 1021, 511, 255, 63 does not belong to his series?

Final Answer:

x =  1021

Step-by-step explanation:

xk = 2 × xk-1+1

1
3
7
15
31
63
127
255
511
1023
2047
4095
8191
16383
32767
65535
131071
...



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