1(4C4.2C1.2C1+ 2x 4C3.2C1.2C2 + 4C2.2C2.2C2) . 6!
In how many different ways the letters of the word VECTOR can be placed in the 8 boxes of the given figure so that no row remains empty?
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UP 0 DOWN 0 0 6
6 Answers
1this was asked 2 me when i was in +1. then i knew the ans bt now i dont. plz explain t to me......
1this was asked 2 me when i was in +1. then i knew the ans bt now i dont. plz explain t to me......
62See..
there are 8 spots.. and there are 6 letters in vector
For each row to be "not" filled, the top row should have 4 of these letters and one of the other 2 rows should have 2 letters.
SO one row remains empty.
We take all the possible cases:
a) 2 in each of the 3 rows
b) 3 in first row, 2 in 2nd, 1 in 3rd
c) 3 in first , 1 in second and 2 in 3rd row
d) 4 in firts, 1 in second and 1 in 3rd row.
each of the terms of sky's expression corresponds to one of these (look carefuly :)