Question:
117, 104, 91, 78, ?
117, 104, 91, 78, ?
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Always check for constant differences first before trying multiplication or alternating patterns in arithmetic sequences.
Updated On: Aug 12, 2025
- 39
- 60
- 65
- 36
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The Correct Option is C
Solution and Explanation
Step 1: Check the difference between consecutive terms:
117 − 104 = 13
104 − 91 = 13
91 − 78 = 13
Step 2: Since the difference is consistently −13, the next term will be: 78 − 13 = 65.
Step 3: Elimination: - Option (a) 39 — would occur after several steps, not immediately next.
- Option (b) 60 — difference from 78 is 18, which breaks the pattern.
- Option (d) 36 — much smaller, so pattern breaks.
104 − 91 = 13
91 − 78 = 13
Step 2: Since the difference is consistently −13, the next term will be: 78 − 13 = 65.
Step 3: Elimination: - Option (a) 39 — would occur after several steps, not immediately next.
- Option (b) 60 — difference from 78 is 18, which breaks the pattern.
- Option (d) 36 — much smaller, so pattern breaks.
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