Pls solve Q 25 Find the number of terms of the AP 18, 1512, 13, - Maths - Arithmetic Progressions

Question

Pls solve
Q 25 Find the number of terms of the AP 18 ,   15 1 2 ,  
13 ,   , - 49 1 2 and find the sum of all its terms

Sandeep Saurav · Accepted Answer

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Pls solve. Q.25. Find the number of terms of the AP 18 , 15 1 2 , 13 , . . . . . . , - 49 1 2 and find the sum of all its terms.

Pls solve.
Q.25. Find the number of terms of the AP $18, 15 \frac{1}{2}, 13, . . . . . ., - 49 \frac{1}{2}$ and find the sum of all its terms.