Question 915469
This would be all the possible ways that
the 5 of them can sit together minus
the ways that Ann and Donna can be
seated together:
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The ways 5 people can sit together is:
{{{ 5*4*3*2*1 = 120 }}}
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The ways Ann and donna can sit together is:
a d x x x 
d a x x x 
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x a d x x 
x d a x x 
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x x a d  x
x x d a  x
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x x x a d
x x x d a
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For each of these 8 cases, the x's
can have: 
{{{ 3*2*1 = 6 }}}  different orderings
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{{{ 6*8 = 48 }}}
and {{{ 120 - 48 = 72 }}}
There are 72 ways they can be seated in a row
Hope I got it