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A valid credit card number is a card that is recognized as real and usable. An invalid card is either expired or falsified.
tridectillion is not a real number but tridecillion is a real number. you may have accidently put an extra "t" in there by accident. tridecillion is a 10 with 42 zeros after it. it is written like this 1042 this number has not been used for anything. it is larger than anything usable by man.
there is covered area can it be calculated in usable area
The usable area of the board is 45cm by 35cm which gives 9*7 = 63 squares.
A usable synonym would be small, and an antonym would be wide.