Question

What can replace '?'
explain how​

Answer 1

Answer:

answer is 7

Step-by-step explanation:

first row = 2, 6, 7

therefore, 7 = 2+6 -1

third row = 4, 9, 12

therefore, 12= 4+9 -1

so, second row = 3, ?, 9

let '?' be 'x'

therefore, 9= 3+x -1

so, 9+1 = 3+x

so, 10-3 = x

therefore 7= x

Answer 2

Answer:

8

Step-by-step explanation:

1st line= 2+6+7=15

2nd line =3+8+9=20

3rd line=4+9+12=25

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