The 7 can go in any of seven places and the 4 in any of the remaining 6. It is irrelevant which 2 goes where so there are 7 x 6 ie 42 possibilities which result in distinct sequences.
Too Many Manys
Number of neutrons = Mass number - Atomic number = 235 - 92 = 147 neutrons
You can write 100 an infinite number of ways; as fractions, multiples, notations, and others.
there are two senators from every state in the u.s. but the house of reps number is different depending on its population
3
it has 4 sides
454.5g
8x7=56
2678400
3 gears
8
1029 days