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General Form of an AP

An AP has d =...

Question

An AP has d = 3 and the last term 7. What is its 3rd term from the last?

A

1

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B

4

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C

-2

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D

-1

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Solution

The correct option is A 1

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Q. (i) An AP 5, 12, 19, ... has 50 terms. Find its last term. Hence, find the sum of its last 15 terms. [CBSE 2015]

(ii) An AP 8, 10, 12, ... has 60 terms. Find its last term. Hence, find the sum of its last 10 terms. [CBSE 2015]

Q. An AP 5, 12, 19, ... has 50 terms. Find its last term. Hence, find the sum of its last 15 terms. [CBSE 2015]

A P

50

3^{r d}

12

and the last term is

106

29^{t h}

Q. An AP has 10 terms. If its first and last terms are 5 and 50 respectively, then its sum is

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