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Install NowExercise 7.2
1. Evaluate:
(i) 8!
(ii) (ii) 4! – 3!
Ans. (i) 8! = 
= 40320
(ii) 4! – 3! = 
= 24 – 6 = 18
2. Is 3! + 4! = 7!?
Ans. L.H.S. = 3! + 4! = 
= 6 + 24 = 30
R.H.S. = 7! = 
= 5040
L.H.S. 
R.H.S.
3. Compute: 
Ans. Given: = 
= 
= 28
4. If 
find 
Ans. Given: 
5. Evaluate: 
when
(i) 
(ii) 
Ans. (i) Given: 
and 
= 30
(ii) Given: 
and 
= 15120
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