Aptitude

✅ The correct answer is option C.
Go on multiplying the number by 2 and adding 1 to it to get the next number.
So, 27 is wrong.

✅ The correct answer is option B.
There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.

✅ The correct answer is option C.
The terms are successively divided by 12, 10, 8, 6, …etc.
So, 24 is wrong, it should be 8 (48/6 = 8).

✅ The correct answer is option B.
The pattern is 23, 33, 43, 53, 63, 73. But, 100 is not a perfect cube.

✅ The correct answer is option B.
In each number except 383, the product of first and third digits is the middle one.

✅ The correct answer is option D.
The numbers are 13, 23, 33, 43 etc. So, 124 is wrong; it must have been 53 i.e., 125.

✅ The correct answer is option B.
In each number except 427, the middle digit is the sum of other two.

✅ The correct answer is option D.
Let the given numbers be A, B, C, D, E, F, G.
Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.
Clearly, 228 is wrong.

✅ The correct answer is option B.
Each of the numbers except 23, is perfect square.

✅ The correct answer is option C.
Each of the number except 279 is a multiple of 11.