Answer:
i think 2m
Step-by-step explanation:
3 plus 3 is 6 minus 8
We start with 80 and we add 1 on the first day, 2 on the 2nd, 4 on the 3rd, etc..
Looking at the numbers being added
1 = 20
2 = 21
4 = 22
8 = 23
16 = 24
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.
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We start with 80 and we add 2n to it where n represents the number of days into the iteration
with n starting at 0
The function that shows how many stamps we have on any given day is
D
S = 80 + ∑ 2n Where D is the number of days we are into the iteration
n=0
NOTE: This starts at day 0 which would be S = 80 + 20 = 80 + 1 = 81 stamps
Example: To find how many stamps we have on D = 4 we would have
S = 80+20+21+22+23+24
= 80+1+2+4+ 8+16
= 111 stamps
