Question

3 8 10 2 ? 1
6 56 90 2 20 0​

Answer 1

Answer:

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Explanation:

3 8 10 2 ? 1 6 56 90 2 20 0

split the series like this  

3 8 10 2 ? 1

6 56 90 2 20 0

add these up and down series and you will get perfect square.

for example 3+6=9

8+56= 64

10+90= 100

2+2=4

?+20= perfect square

?+20=25,   ?=5

1+0=1