Quote:
Originally posted by fusionx
1. Key into the calculator the first 3 digits of your phone number (not
area code).
2. Multiply by 80
3. Add 1
4. Multiply by 250
5. Add last 4 digits of your phone number
6. Add last 4 digits of your phone number again
7. Subtract 250
8. Lastly, divide by 2
Is this your phone number???
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let ABCDEFG be your phone #, each letter is a digit
step 1.
ABC
step 2.
ABC * 80
step 3.
(ABC * 80) + 1
step 4.
((ABC * 80) + 1) * 250
which is
(ABC * 20000) + 250
which is
(2 * ABC0000) + 250
step 5.
(2 * ABC0000) + 250 + DEFG
step 6.
(2 * ABC0000) + 250 + DEFG + DEFG
which is
(2 * ABC0000) + 250 + (2 * DEFG)
which is
(2 * ABCDEFG) + 250
step 7.
2 * ABCDEFG
step 8.
ABCDEFG