Question

Find the missing number 3, 8, 18, , 78 view the solution

Answer 1

The missing number in the number sequence 3, 8, 18, , 78 is 38.

The difference between two consecutive numbers here is doubling from one pair to the next pair.

Moreover, all these differences are multiples of 5.

So the difference between 3 and 8 is 5; while the difference between 8 and 18 is 10.

Therefore, the next difference will be 20, which gives to 18 + 20 = 38.