1, 2, 4, 8, 16, 32, 64, (...), 256?

Correct Answer: 65

Explanation:

Alternately, we add 5 and subtract 7.

Correct Answer: 75

Explanation:

Second number is one more than twice the first third number is one less than twice the second, fourth number is one more than twice the third, fifth number is one less than the fourth. Therefore, the sixth number is one more than twice the fifth. So, the missing number is 75.

Correct Answer: 16

Explanation:

Alternately, we add 3 and subtract 1.

Correct Answer: 160

Explanation:

Double the number and add 1 to it, to get the next number. So, 160 is wrong.

Correct Answer: 102

Explanation:

The pattern is x² + 3, where x = 4, 5, 6, 7, 8, 9 etc. But 102 is out of pattern.

Correct Answer: 40

Explanation:

There are two series (10, 13, 16, 19) and (5, 10, 20, 40)one increasing by 3 and another multiplied by 2.

Correct Answer: 435

Explanation:

Each number is 15 multiplied by a prime number i.e., 15 x 11, 15 x 13, 15 x 17, 15 x 19, 15 x 23. So, the next number is 15 x 29 = 435.

Correct Answer: 92

Explanation:

Go on dividing by 6, 5, 4, 3, 2, 1 respectively to obtain the next number. Clearly, 92 is wrong.

Correct Answer: 27

Explanation:

Go on multiplying the number by 2 and adding 1 to it to get the next number. So, 27 is wrong.

Correct Answer: 228

Explanation:

Let the given number be A, B, C, D, E, F, G. Then 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 number . Clearly, 228 is wrong.