Question

Find the missing term(s) in the following series.
Sections
13, 30, ?, 148, 273

Answer 1

Answer:

75

Step-by-step explanation:

Let the missing number be x.

13               30             x            148 .......

      17              x-30         148-x   --- 1st level difference

Let y be the common addition factor for 2nd level difference.

17 + y = x - 30  .... (1)

x-30 + y = 148 - x .... (2)

Solving (1) and (2) we get, x-y = 47; 2x + y = 178

3x = 225

Therefore, x = 75

So the missing number is 75.

Answer 2

The missing number(?) is "75".

Step-by-step explanation:

The given sequence are:

13, 30, ?, 148, 299

The pattern follow:

+ 17 , + (17 × 2) + 1, + (35 × 2) + 3,......

To find, missing number(?) = ?

30 = 13 + 17 = 30

? = 30 + 2 × 17 + 1 = 30 + 35 = 75

148 = 75 + 2 × 35 + 3 =75 + 73 = 148

299 = 148 + 2 × 73 + 5 = 148 + 151 = 299

Hence, the missing number(?) is "75".