Multiple choice

The next term in the following series is $1,2,5,16,65,326,$?

  1. $1956$
  2. $1957$
  3. $1955$
  4. $1987$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is: 1*1+1=2, 2*2+1=5, 5*3+1=16, 16*4+1=65, 65*5+1=326, 326*6+1=1957.

AI explanation

The pattern is multiplying the current term by its position index and then adding 1 to find the next term. For 1, the calculation is 1 times 1 plus 1, which equals 2, and for 2, the calculation is 2 times 2 plus 1, which equals 5. Applying this to 326 gives 326 times 6 plus 1, resulting in 1957, so the result is 1957.

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