Q.1 – Q.2 , Q.3 – Q.4 Q.5 , Q.6 , Q.7 , Q.9 , Q. 10 , Q. 11 Q.12 , Q.13 , Q. 14 , Q. 15 Q.16 to Q. 19
Answer 6
There are five letters
Letters can be ordered in 5! Ways
5! = 5 x 4 x 3 x 2 x 1
= 120
Answer 7
There are five seats and FIVE members
Total ways possible = 120
The number of ways Martha can sit in the middle seat = (5-1)!
= 4!
= 4 x 3 x 2 x 1
= 24
Answer 8
Three digit number means , numbers between 100 999.
Choices possible for first digit from 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9
As ‘0’ cannot be at the first place and ‘5’ is not to be considered ; the possible options could be 1 , 2 , 3, 4 , 6 , 7 , 8
Total 8 choices possible for integer at first place
Choices possible for second digit from 0 , 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9
‘9’ possible options as ‘5’ cannot be considered
The choices available for third digit are 1 , 3 , 5, 7 ,9 , as the integer to be odd
Total ‘4’ choices possible
So, total 3-digit positive odd integers which do not contain digit’5’ will be = 8 x 9 x 4
= 288
Q.1 – Q.2 , Q.3 – Q.4 Q.5 , Q.6 , Q.7 , Q.9 , Q. 10 , Q. 11 Q.12 , Q.13 , Q. 14 , Q. 15 Q.16 to Q. 19
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