[Ques]: Find the odd man out
4, 9,16, 36, 64, 144
Options:
(A) 144
(B) 16
(C) 9
(D) 36
(E) 4
*Ans*: (C)
--CoT--: 9 is square of 3 which is odd number where as all others are squares of even numbers.

[Ques]: How many digits are in the number 50^8 8^3 11^3?
Options:
(A) 22
(B) 20
(C) 19
(D) 18
(E) 17
*Ans*: (B)
--CoT--: Whenever you are asked to find the number of digits, try to bring the number in multiples of 10. This way, we can wasily calculate the umber of 0's through the powers of 10
50^8 8^3 11^3 = (5^2*2)^8*2^9*11^3 = 5^16*2^17*11^3 = 2*11^3*10^16 = 2662*10^16
Hence we would have 16 trailing 0's and the three digits from 2662
Total digits = 4 + 16 = 20

[Ques]: A train 260 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
Options:
(A) 40 sec
(B) 50 sec
(C) 32 sec
(D) 49 sec
(E) 60 sec
*Ans*: (C)
--CoT--: Speed = 45 * 5/18 = 25/2 m/sec
Total distance covered = 260 + 140 = 400 m
Required time = 400 * 2/25 = 32 se

[Ques]: Right triangle PQR is the base of the prism in the figure above. If PQ=PR=5 and the height of the prism is 10, what is the volume of the prism?
Options:
(A) 5
(B) 10
(C) 15
(D) 20
(E) 25
*Ans*: (E)
--CoT--: Volume of prism = Area of base * height = 1/2* (square root of 5) * (square root of 5)*10 = 25