Please solve the 10 th question. Please do not provide any link. Q.10. In an A.P., the first term is 25, ${n}^{th}$ term is - 17 and the sum of n terms is 132. Find n and the common difference.

4. If for a G.P., p

^{th}, q^{th}and r^{th}terms are a, b and c respectively; prove that:(q - r) log a + (r - p) log b + (p -q) log c = 0

6.In a school, students decided to plant trees in and around the school to reduce air pollution.It was decided that the number of trees, that each section of each class will plant, will be

five times of the class to which the respective section belongs. If there are 1 to 10 classes

in the school and each class has three sections, find how many trees were planted by the

students ?

5.Mrs. Gupta repays her total loan of Rs 1,18,000 by paying instalments every month. If the instalment for the first month is Rs 1,000 and it increases by Rs 100 every month, what amount will she pay as the 30^{th}instalment of loan ? What amount of loan she still has to pay after the 30^{th}instalment ?Please solve the 10 th question.

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Q.10. In an A.P., the first term is 25, ${n}^{th}$ term is - 17 and the sum of n terms is 132. Find n and the common difference.

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Q.6. The sum of first 7 terms of an A.P. is 49 and that of first 17 terms of it is 289. Find the sum of first n terms.

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.$11.Ifa,bandcareinA.Pshowthat:\phantom{\rule{0ex}{0ex}}i)4a,4band4careinA.P\phantom{\rule{0ex}{0ex}}ii)a+4,b+4andc+4areinA.P$

Q. (x + 1) (x + 2) (x + 3) (x + k) + 1. Find the value of k.

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Q.2. The ${n}^{th}$ term of a sequence is (2n - 3), find its fifteenth term.

a. 3/7 b. 7/3 c. 6/7 d. 7/6