The
formula 
, where r! is 1*2*3*...r
is the
formula which gives us the total number of ways of forming groups of r objects out of n objects.
for
example, given 10 objects, there are C(10,6) ways of forming groups of 6, out
of the 10 objects.
<span>Thus, there are C(6, 3) many ways of forming different triples out of 6.</span>
Answer: A.20
Subtraction is "addition of the opposite."
8 - 9 = 8 + (-9)
-7 - 2 = -7 + (-2)
-6 - (-3) = -6 + 3
<span>x=<span><span>16</span>+<span><span><span><span>16</span><span>√133</span></span><span> or </span></span>x</span></span></span>=<span><span>16</span>+<span><span><span>−1</span>6</span><span>√<span>133 ---- Use the quadratic formula. </span></span></span></span>
The term equivalent to 
is :
