#
SAT Question of The Day 6th July 2013

### , , ,, …

### The first four terms of a sequence are shown above. Which of the following could be the formula that gives the th term of this sequence for all positive integers ?

### A.

### B.

### C.

### D.

### E.

### One approach is plug in – n stands for the position of the term in the sequence.

### If we plug in 1 to the formula instead of n we should obtain 3, when we plug in 2 we will get 6, 3 to give 11 and 4 to obtain 18.

### Only n^2+2 delivers each time.

### 52% of 172,000 got it right.

### P.S. in questions where plugging in seems to be the best option start from the last answer.

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