Q: How many strings with seven or more characters can be formed from the letters in EVERGREEN?
What am I suppose to do for this question? Since it asks for "seven or more", am i suppose to add up all the different possibilities?
My answer
im not sure if its right)
[ (7!/(2!2!)) + (7!/(4!)) + (7!/(3!)) ]- For this i took out 2 E's, then 2 R's, then E and R
+
[ (8!/(3!2!)) + (8!/(4!)) ]- For this i took out 1 E, then 1 R.
+
[ 9!/(4!2!)
Is that the correct answer? If not please correct me.
Thanks
Creative