Find the missing number:
2, 6, 12, 20, ?, 42

Question

Accepted Answer

1. Look for a rule. The terms fit the formula $n(n+1)$ for $n=1,2,\dots$.
2. Check: $1	imes2=2$, $2	imes3=6$, $3	imes4=12$, $4	imes5=20$.
3. So the 5th term is $5	imes6=30$.
4. That matches option **(b)**.

FINAL_ANSWER: <b>

Answer

Answer

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