If 18a1=34, 19a2=34 and 18a3=30, then find the value of 18a8=?
- A6
- B16
- C20
- D8
Solution & Step-by-step Explanation
Let us decipher the operations behind 'a':
Look at the first statement: 18a1=34
2×(18−1)=2×17=34
Look at the second statement: 19a2=34
2×(19−2)=2×17=34
Look at the third statement: 18a3=30
2×(18−3)=2×15=30
The logic is: XaY=2×(X−Y).
Applying this rule to find 18a8:
2×(18−8)=2×10=20
Look at the first statement: 18a1=34
2×(18−1)=2×17=34
Look at the second statement: 19a2=34
2×(19−2)=2×17=34
Look at the third statement: 18a3=30
2×(18−3)=2×15=30
The logic is: XaY=2×(X−Y).
Applying this rule to find 18a8:
2×(18−8)=2×10=20