hmm I will give brain mark who's solve my problem 12 Q no 1
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amitnrw:
(N!/)(N-5)! = 42 × N!/(N-3)! So 1= 42/(N-5(N-4) so (N-5)(N-4)= 42 whle 6×7 = 42 so N = 11 as (11-5)×(11-4)= 42
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Answer:
10
Step-by-step explanation:
(N!/)(N-5)! = 42 × N!/(N-3)!
1/(N-5)! = 42/(N-3)((N-4)((N-5)!)
1= 42/(N-3(N-4)
(N-3)((N-4) = 42
N^2 - 7N + 12 = 42
N^2 - 7N -30 = 0
N^2 -10N + 3N -30 = 0
(N-10)(N+3) = 0
So N = 10 as N greater than 4
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