Book Maths Puzzle Numerical Ability Permutation and Combination

Q:- The number of values of r satisfying the equation 39C3r-1 -39Cr^2=39Cr^2 -1 -39C3r is
a)1
b)2
c)3
d)4

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Book Other Question

three boxes should be filled with odd numbers between 1 to 19 and the sum should be 30.we should use only adddition. 1.5 5 20 74 215 422
6 (a) (b) (c) (d) (e)
what will come in place of (b)...?