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It is given P and S cannot sit at extreme ends of the row and P sits at third position to the right of S and E is siting directly opposite to S. The arrangement will be Now exactly two persons are sitting between R and T and R is sitting at any ends of the rows so there will be two possibility and F cannot sit opposite to P or Q and also not next to E and not at the ends. Two persons are sitting between C and B So only one possibility will be left.
Now A cannot sit next to C and F is not sitting directly opposite to Q or P. So the final arrangement will be as shown below:
15, 120, 840, 5040, ?, 100800
11 22.5 47 102 236 ?
...What will come in place of the question mark (?) in the following series?
2.5, 6.5, 18.5, 54.5, 162.5, 486.5, ?
140, 146, 158, 176, ?, 230
17 18 14 ? 7 32
...10, 10, 30, 150, ?, 9450
17, 19, 41, 127, 513, ?
116, 118, 124, 136, 156, ?
-1, 5, 23, 59, ?
84, 97, ?, 162, 214, 279