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Completion



Complete the following letters :  AC BD CE DF ??
Answer :
EG

Find the two numbers : 20 18 180 178 ? ? 17780
Answer :
1780 and 1778.

Start with 20-2=18; then include 0 to 18=180
Now 180-2=178; now include 0 to 178=1780 and 1780-2=1778.


What is the next number?  365  332  300  269  ...
Answer :
239


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