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Question
The following lists of numbers form an A.P.? If they form an A.P., find the common difference d and write the next three terms.
12,22, 32, 42,...
Sum
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Solution
a2 – a1
= 22 – (1)2
= 4 – 1
= 3
a3 – a2
= 32 – (2)2
= 9 – 4
= 5
a4 – a3
= 42 – (3)2
= 16 – 9
= 7
i.e., ak + 1 – ak is not the same every time.
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