In how many different ways a grandfather along with two of his grandsons and four grand daughters can
be seated in a line for a photograph so that he is always in the middle and the two grandsons are neveradjacent to each other?
(sir please give solution of above using gap method)
Asked by jaychandran1967
6th May 2018,
1:29 PM
Answered by Expert
Answer:
G b1 b2 g1 g2 g3 g4
total 7 places
G will sit on 4th place always = 1 way
_ _ _ G _ _ _
remaining 6 places
b1 and b2 will never be together
this can be found out by: Total - (b1 and b2 always together)
b1 and b2 one unit and rest 4 so 5 in all = 5!2!
now total ways is 6!
so 6!-5!2!
Answered by Expert
7th May 2018,
12:14 PM
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