Insert the missing number.
Answer: Option B
Explanation:
Go on multiplying the given numbers by 2, 3, 4, 5, 6.
So, the correct next number is 1440.
Answer: Option C
Numbers are 12, 22, 32, 42, 52, 62, 72.
So, the next number is 82 = 64.
Answer: Option A
Numbers are all primes. The next prime is 43.
Numbers are (23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1) etc.
So, the next number is (83 - 1) = (512 - 1) = 511.
Numbers are alternatively multiplied by 2 and increased by 3.
So, the missing number = 61 x 2 = 122.
There are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted.
The next number is 1 - 2 = -1.
Each number is double the preceding one plus 1.
So, the next number is (255 x 2) + 1 = 511.
Numbers are 13, 23, 33, 43, 53, 63.
So, the missing number is 73 = 343.
Numbers are alternatively multiplied by 3 and divided by 2.
So, the next number = 54 ÷ 2 = 27.
The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8.
So, the next number is 8 x 9 = 72.
