A humble wish ? A greedy wish ?

Once upon a time in japan, there was a warrior who won in a battle. His commander was pleased and promised to give him anything he wants as a reward. So the warrior said

[Here is a chess board. It has 9 x 9 small square block on it. Today, please place 1 rice on the top left square and let me take home. Tomorrow, place 2 rice on the next square and let me take home. The next day, place 4 rice on the following square and let me take home. And continue to double the amount of rice on each following day until all the square block on the chess are occupied.]

 The commander thought to himself

[All I need to do is to place some rice on the blocks for 81 days and let him take home. What a humble wish he’d asked for !]

And so without hestitation the commander granted the warrior’s wish. But, was it really a humble wish?

 day 1: 1 rice (2^0)

day 2: 2 rice (2^1)

day 3: 4 rice (2^2)

day 4: 8 rice (2^3)

day 10: 1024 rice (2^10)

day 20: 1 million rice (2^20)

day 30: 1 billion rice

day 40: 1.1 trillion rice

day 50: 1.1 quadrillion (1000 billion)

day 60: 1.2 quintillion

day 70: 1.2 sextillion (1000 trillion)

day 80: 1.2 septillion

day 81: 2.4 septillion

How huge was the number 2.4 septillion ? Erm … try to fully utilise google … I guess google can explain it … (or not ?!?!?)

Do you think you can place 2.4 septillion on a square block on the chess board ? No. Not even on a small island.

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