JEE MAIN - Mathematics (2021 - 1st September Evening Shift - No. 20)
All the arrangements, with or without meaning, of the word FARMER are written excluding any word that has two R appearing together. The arrangements are listed serially in the alphabetic order as in the English dictionary. Then the serial number of the word FARMER in this list is ___________.
Answer
77
Explanation
First find all possible words and then subtract words
from each case that have both R together.
FARMER (6)
A, E, F, M, R, R
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FARMER (6)
A, E, F, M, R, R
| A | |||||
|---|---|---|---|---|---|
| E | |||||
| F | A | E | |||
| F | A | M | |||
| F | A | R | E | ||
| F | A | R | M | E | R |
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