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Find the odd one out.
If a - b = 3 and a^2 + b^2 = 29, find the value of ab.
If x = 1 + 2 + 3 + ... + 32, what will be the unit place digit of x^2?
If sin x + cos x = √2, find the value of (cos x)^4 - (cos x)^2.
If log₂ 128 = 2.1072, then find the value of log₂ 16.
The 7th and 21st terms of an AP are 6 and -22 respectively. Find the 30th term
If a=3, b=9, c=27, d=81 and this pattern continues, find the value of the unit digit of y according to this pattern.
Two numbers are respectively 20% and 25% more than a third number. What is the percentage that the first number is of the second number?
1, 2, 3 and 4 can form 256 different four digit numbers. If digits repeated, two of them are 1111 and 1113. Then find the sum of 256 numbers.
Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:
