KBAT AP Question - How to sum all numbers when don't have same d value.

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In this video you will learn how to identify the question is joined by two different progression and how to find the last term of it.

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Hello, in which year can I find this question?

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The easiest way to determine either 87 or 82 belongs to which AP is to subtract them from their first term and see if the results would divisible by 7 (the common difference)..

For example, 87-3 = 84 (divisible by 7).. But if we do, 87-5=82( not divisible by 7). Hence from here we are confirmed 100% that 87 belongs to red colored AP !!

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