Question 1149533
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(1) The N and D can be separated by exactly 2 other letters if they in positions 1 and 4, or 2 and 5, or 3 and 6, or 4 and 7.  That's 4 choices.<br>
(2) For any of the choices from (1), either the N or D can be first.  That's 2 choices.<br>
(3) For any of the choices from (1) and (2), the remaining 5 letters can be arranged in 5!=120 ways.<br>
ANSWER: (4)*(2)*(120) = 960<br>