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anjli7025@Gmail.com from adarsh jante high school , chapra
Subject :ICSO    Class : Class 10
The sum of all term of the arithmetic progression having ten term except for first term is 99 and except for sixth term is 89 find the third term of progression if the sum of first and fifth term is10

Ans 1:

Sujay Karmakar from Kendriya Vidyalaya , Salt lake
Class : Class 10
5

Ans 2:

Adarsh from devsangh national school , deoghar
Class : Class 10
Answer 13 hake

Ans 3:

Sagar Dev Achar from Sri Chaitanya Techno School, Bengaluru
Class : Class 10
Sum of n terms - First Term = 99 | 0.5 * n * [2a + (n-1)d] - a = 99 | 0.5 * 10 * [2a + 9d] - a = 99 | 10a + 45d - a = 99 | 9a + 45d = 99 | a + 5d = 11 --> Eq 1 | First Term + Fifth Term = 10 | a + a + 4d = 10 | 2a + 4d = 10 | a + 2d = 5 | a = 5 - 2d --> Eq 2 | On Substituting Eq 2 in Eq 1 | 5 - 2d + 5d = 11 | 5 + 3d = 11 | 3d = 6 | d = 2 | | On Substituting d = 2 in Eq 2 | a = 5 - 4 | a = 1 | | Third term = a + 2d = 1 + 4 = 5

Ans 4:

Pratik from dps, Visakhapatnam
Class : Class 10
5

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