Answer 27(D).
This question requires deep thinking in the sense that you have to look for the examples
to refute the statements. We will take one by one. If product of two prime numbers when
divided by 10 gives us an integer we can remove all answers containing (i). So we take 5
and 2. When multiplied and then divided by 10 we get an integer 1. So (i) is true. Get rid
of A. We move to (ii). Lets take 0. This when divided by 10 gives 0, which again is an
integer. So (ii) is also true. So get rid of B and C. Now we just need to verify D as it is the
obvious choice. Any odd integer when divided by 10 would always leave decimal and
never an integer. So D cannot be true. Hence it is the answer.
Answer 28(B).
Here’s another smart Question. It appears to be daunting but it’s not that tough. We start
with 1 at units place. When multiplied 3 times and then divided by 2 we get 1.5. So it is
ruled out. Next we try with 2. When we multiply by 3 we get 6 which when divided by 2
gives us 3.Bingo!! We get the first number 32. Similarly by trying out different numbers
at unit place we get other 2 numbers as 64 and 96(which are also multiples of 32 for
hint). So we get a total of 3 numbers between 10 and 99.
Answer 29(A).
Lets try this question by trial and error. Lets try to get all answers starting with smallest
value 44. It can be sum of 22 and 22. So (E) is ruled out. Now move to 99. It could be
sum of 54 and 45. So (D) goes. Next 121 could be written as 56 + 65. So even (C) goes.
Now try out 165. It could be the sum of 87 and 78. So after POE rest four (A) becomes
the answer, as it cannot be written as sum of desired combination.
Answer 30(B).
We need to see the fact statements. Statement (1) says that the length of AC is less than
the length of BC. This clearly leads us to nowhere. So BCE. Now the fact statement (2)
tells us that the length of AB is one-fourth the circumference of the circle, which clearly
leads us to know that it is not the diameter, it is just a chord. So the angle subtended is not
equal to 90 deg. So the answer is (B).
Answer 31 (B).
The entire discussion of rounds is a red herring. The question is asking for possible
combinations of the final 3, and it is possible for any of the original 8 contestants to have
advanced to the final round, thus we need to pick 3 out of 8, and order doesn’t matter.
8*7*6/3*2*1=56.