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Question

Verify the AP:5,143,133,4.... and find the sum of the next three terms:

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Solution

We have,
1435=13;
133143=13;
This shows that difference of a term and the preceding term is always same.Hence, the given sequence form an AP.
Here first term a=5 and common difference d=13
Therefore,
a5=a+4d=5+4×13
a5=113
a6=a+5d=5+5×13
a5=103
a7=a+6d=5+6×13
a7=3
Hence, the next three terms are
113,103,3


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