Number of quadratic expressions

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zareentaj: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Fri Aug 06, 2010 11:12 pm

by zareentaj » Tue Aug 10, 2010 10:16 pm

The number of quadratic expressions with the coefficient drawn from the set{0,1,2,3} is:
(a)21
(b)36
(c)48
(d)64

Source: Beat The GMAT — Problem Solving | Tue Aug 10, 2010 10:16 pm

vijayantj: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sat Apr 03, 2010 4:16 am; GMAT Score:500

by vijayantj » Tue Aug 10, 2010 10:45 pm

zareentaj wrote:The number of quadratic expressions with the coefficient drawn from the set{0,1,2,3} is:
(a)21
(b)36
(c)48
(d)64

[spoiler]Answer is (C) 48[/spoiler]

ax2+bx+c

3*4*4 = 48
3 ways for x2
4 ways for x
4 ways for c

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