In how many ways can the letters of the word “CONVENIENCE” be arranged so that they begin with 2Ns and end with 2Es?
NN_ _ _ _ _ _ _EE
The 7 places have to be filled by 2 Cs, O, N, V, E and I. This can be done in 7!/(2!)
Hence option (e)
In how many different ways can the letters of the word MONDAY be arranged ? How many arrangements begin with M ? How many begin with M and do not end with N ?