Solve the problem.List all the combinations of 6 objects a, b, c, d, e, and f taken 2 at a time. What is C(6, 2)?
A. aa, ab, ac, ad, ae, af, ba, bb, bc, bd, be, bf, ca, cb, cc, cd, ce, cf, da, db, dc, dd, de, df, ea, eb, ec, ed, ee, ef, fa, fb, fc, fd, fe, ff
C(6, 2) = 36
B. ab, ac, ad, ae, bc, bd, be, cd, ce, cf, de, df
C(6, 2) = 12
C. ab, ac, ad, ae, af, ba, bc, bd, be, bf, ca, cb, cd, ce, cf, da, db, dc, de, df, ea, eb, ec, ed, ef, fa, fb, fc, fd, fe
C(6, 2) = 30
D. ab, ac, ad, ae, af, bc, bd, be, bf, cd, ce, cf, de, df, ef
C(6, 2) = 15
Answer: D
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