Math, asked by Radhikadimri1, 6 months ago

The first term of an arithmetic progression is 61 and the second term is 57.
The sum of the first n terms is n. Find the value of the positive integer n.

Answers

Answered by mahawirsingh15
1

Answer:

From the given information, we can compile following data for Arithmetic Progression (A.P);

The expression for difference in Arithmetic Progression (A.P) is:

For the given case;

Expression for the sum of number of terms in the Arithmetic Progression (A.P) is:

For the given case;

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Answered by Sankalp050
3

Answer:

Perimeter of trapezium = 104 m

Length of Non-parallel sides = 18 m and 22 m

Altitude = 16m

Area of Trapezium = 0.5 * (sum of parallel sides)*altitude ------ (1)

Sum of parallel sides = Perimeter - (sum of non-parallel sides) = 104 m - (18+22)m = 104-40 m = 64 m

From (1), Area of Trapezium = 0.5*64*16 = 512 m^2

Ans: Area of trapezium = 512 m^2

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