Question

in the
following
Find the missing
question
is15,19, 30, 60, 145 ?​

Answer 1

Step-by-step explanation:

19-15=4

30-19=11

60-30=30

145-60=85

11-4=7

30-11=19

85-30=55

19-7=12

55-19=36(12*3)

so,36*3=108

55+108=163

163+85=243

243+145=393

so, the missing number is 393

Answer 2

Answer:

Step-by-step explanation:

Concept:

The concept of number series of reasoning will help us to solve the question.

Given:

The number series which are given in the question is $15,19, 30, 60, 145 ?$.

To Find:

We have to determine the value which is marked by question sign that means the last value of this series.

Solution:

First we have to get the differences of the numbers of the given series.

We will get the below values.

First difference  $19-15=4$

Second difference $30-19=11$

Third difference is $60-30=30$

and the fourth difference is $145-60=85$

Again the substractions  have to be done between the above differences.Now we will get three values as there are four differences.

First difference $11-4=7$

Second difference $30-11=19$

Third difference is $85-30=55$

Similarly we have to determine the differences between the above values.

First difference is $19-7=12$ and

Second difference is $55-19=36$

This $36$ is the multiplication of $12$ and $3$ .

To get the unknown value, we have to multiply $3$ with $36$ first.

$36 \times 3=108$

Now add $108$ with $55$ .

$108+55=163$ .

Again we have to do sum $163$ with $85$.

$163+85=248$.

Atlast we will do the sum of $248$ and $145$.

$248+145=393$.

Therefore, the unknown number of the series is $393$  and the series is $15,19, 30, 60, 145 , 393$ .

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