Question

the value of a in the following pattern is
1) 71
2) 16
3) 25
4) 61

Answer 1

Here if you see in the first case we have 4 numbers


4, 2, 10 and last 16
Here,

4 + 2 + 10 = 16


Now second case we have four numbers

16, 8, 15 and last 39

=> 16 + 8 + 15 = 39


Now in the third case we have thee numbers and a variable

We have 39, 12, 20 and last a

If we apply the same pattern we get

39 + 12 + 20 = a

=> 71 = a


So the value of a is 71