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Number of quadratic expressions

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Junior | Next Rank: 30 Posts
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Number of quadratic expressions

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
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Newbie | Next Rank: 10 Posts
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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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