Q. What kind of sequence is this?121,144,169,196,…Choices:(A) arithmetic(B) geometric(C) both(D) neither
Verify Differences Uniform: Let's verify if the differences between consecutive terms are uniform. Given sequence: 121,144,169,196,ext... Are the consecutive differences in the sequence equal? 144−121=23, 169−144=25, 196−169=27. The consecutive differences in the sequence are not equal, but they are increasing by 2 each time.
Check Ratios Equal: Let's check whether the ratios between consecutive terms are equal. Given sequence: 121,144,169,196,ext... Are the ratios between consecutive terms in the sequence equal? 144/121 is not an integer, 169/144 is not an integer, 196/169 is not an integer. The sequence does not have a common ratio.
Identify Sequence Type: Arithmetic sequence: Consecutive terms have a common difference. Geometric sequence: Consecutive terms have a common ratio. 121,144,169,196,… What type of sequence is this? The sequence has increasing differences and no common ratio. However, the differences are increasing by a constant amount, which suggests a pattern. Let's examine the numbers more closely. These numbers are perfect squares: 121=112,144=122,169=132,196=142. Each term is the square of consecutive integers, which means the difference between consecutive terms will always be an odd number that increases by 2 each time. This is a special characteristic of perfect squares.
Determine Correct Choice: Since the sequence is neither arithmetic (no common difference) nor geometric (no common ratio), but it does follow a specific pattern of perfect squares of consecutive integers, the correct choice is neither arithmetic nor geometric.
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