A) 450
B) 350
C) 250
D) 325
Correct Answer: A
Solution :
[a] Let the number be \[n=pqr.\] As \[p+q+r\] is even, there are following cases: (i) p, q, r all are even \[\to 4.5.5=100\] ways (ii) p even and q, r are odd \[\to 4.5.5=100\]ways (iii) p odd, q and r even \[\to 5.5.5=125\]ways (iv) p odd, q even, r odd\[\to 5.5.5=125\] Total ways \[=100+100+125+125=450.\]You need to login to perform this action.
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