In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Select the set in which the numbers are related in the same way as the numbers of the following sets.
10, 49
14, 69
A.17, 89
B.17, 88
C.18, 89✓ Correct
D.18, 88
Explanation
The pattern is: number × 5 − 1. So 10×5−1=49 and 14×5−1=69. Applying to 18: 18×5−1=89, giving the pair 18, 89.
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