How many two-digit numbers are divisible by 7?
A12
B13
C14
D15
Explanation
Two-digit multiples of 7 range from 14 to 98. Sequence: 14, 21, …, 98. T_n = a + (n – 1)d => 98 = 14 + (n – 1)7 => 84 = 7(n – 1) => n – 1 = 12 => n = 13.
Exam Relevance
- Topic: Number System
- Subtopic: Arithmetic Progression
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