What is the difference between 2N and `N_2`?

The average of numbers N1 and N2 is 17. The average of numbers N2 and N3 is 44. What is the difference between N3 and N1?

What is the difference between mN and N . M?

What is the difference between Buna-N and Buna-S.

What is the difference between Buna-N and Buna-S.

Explain the difference between 2 N and N_(2) .

What is the difference between p type and n type semiconductor with respect to doping?

What is the difference between an ordinary p-n junction diode and a Zener diode?

What is the energy difference between the n=2 and n=3 levels for the hydrogen atom?