AIEEE Exam undefined

If all the permutations of the letters in the word
'OBJECT' are arranged (and numbered serially)
in alphabetical order as in a dictionary, then the
717th word is -
(A) TOJECB (B) TOJEBC
(C) TOCJEB (D) TOJCBE

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AIEEE Other Question

A student is allowed to select at most n books
from a collection of (2n + 1) books. If the total
number of ways in which he can select at least
one book is 63, then the value of n is -
(A) 2 (B) 3 (C) 4 (D) 5 If U is a universal set and A and B are its two
subsets such that n(U) = 700 and n(A) = 300,
n(B) = 200, n (A ∩ B) = 100 then n(AC
∩ BC
) =
(A) 100 (B) 300
(C) 400 (D) 600