Question

find the missing number 3 5 1 7 16, 3 5 2 8 24, 7 4 3 1 x

Answer 1

Given that,

The series of numbers are,

3 5 1 7 16

3 5 2 8 24

7 4 3 1 x

We need to find the method how to obtained last digit of all number

Firstly, we add first three digits and multiply by fourth digit and add 1

So, last number of first series

$=3+5+1\times7 +1$

$=16$

For last number of second series

$=3+5+2\times8 +0$

$=24$

For last number of third series

$=7+4+3\times1 -1$

$=13$

Hence, The missing number is 13