Select the correct alternative from the given ones that will complete the…
2018
Select the correct alternative from the given ones that will complete the number series: 7, 14, 42, 168, ?
- A.
1008
- B.
840
- C.
504
- D.
672
Attempted by 292 students.
Show answer & explanation
Correct answer: B
Key idea: each term is obtained by multiplying the previous term by consecutive integers.
Step 1: Verify the pattern with given terms: 7 × 2 = 14, 14 × 3 = 42, 42 × 4 = 168.
Step 2: Continue the pattern by multiplying 168 by the next integer, 5: 168 × 5 = 840.
Step 3: Conclude the correct next number is 840.
Answer: 840
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