The number of ways 7 different books can be stacked on a shelf is the same as the number of permutations of 7 things taken 7 at a time, which is 7 factorial, or 5040.
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6c4=15
The answer depends on how the pyramids are stacked.
81
about 160- 190
The Bible was written from around 1445 BC -- 96 AD. Different books were written at different times the Old Testament first and then the New Testament