Question

Find the missing number in the following series 3420, 1660, 780, 340, ?, 10

Answer 1

The missing number is 120

Answer 2

Answer:

The required missing number is 120.  

Step-by-step explanation:

Given : Series 3420, 1660, 780, 340, ?, 10.

To find : The missing number in the following series ?

Solution :

According to series taking first number then divide it by 2 and subtract 50 from it we get the next number.

As $\frac{3420}{2}-50=1710-50=1660$

Now, Follow this pattern for next terms

$\frac{1660}{2}-50=830-50=780$

$\frac{780}{2}-50=390-50=340$

Similarly,

$\frac{340}{2}-50=170-50=120$

For confirmation,

$\frac{120}{2}-50=60-50=10$

Therefore, The required missing number is 120.