Answer :

Answer: 35   42    49   56     63     70

Step-by-step explanation:

Formula: S= X3-X2

X1=?

X2=42

X3=49

X4=?

X5=63

X6=?

SOLUTION: S=49-42=7

X1=X2-S= 42-7=35

X4=X3+S=49+7=56

X6=X5+S=63+7=70