Question

Consider two systems, A and B. A consists of 4 molecules in 9 grid boxes. B consists of the same 4 molecules in 18 grid boxes

9x8x7x6 =9x7x2=126 A4!5! 4x3x2 18! 18x17x16x15 B = 4!14! 24 -= 3060 WB – 3060 = 24.3 W 126

Please Explain how the answer was formed.

Where did the (9x8x7x6) and (18x17x116x15) come from?

For (9! / 4!5!), Does it represent 4 colored shapes and 5 empty?

​​​​​​​**Any tips to remember these steps? **

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Answer #1

In Wa 9! Is present because it isthe total number grids. Here we to find the number of ways the molecules selected. The same with 18!

Yes 4!and 5! Reparaset box with molecules and not respectively.

Tips to remember

Neumerator isthe total

By adding the Denominator we should get neumerator.

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