Or, if we call the first value [math]a_1[/math], the sequence is given by [math]a_n = 2^n-1[/math]
The first approach to analyzing almost any sequence is to look at the differences of successive elements. In this sequence, that’s 2, 4, 8, 16, 32. That makes the answers above pretty easy.
Answers & Comments
Answer:
B. 31
Step-by-step explanation:
Add successive powers of 2 to the number:
1+2=3
3+4=7
7+8=15
15+16=31
Answer:
31
Step-by-step explanation:
Add successive powers of 2 to the number:
1+2=3; 3+4=7; 7+8=15; 15+16=31; 31+32=63; 63+64=127.
Or, if we call the first value [math]a_1[/math], the sequence is given by [math]a_n = 2^n-1[/math]
The first approach to analyzing almost any sequence is to look at the differences of successive elements. In this sequence, that’s 2, 4, 8, 16, 32. That makes the answers above pretty easy.