Question

if 21th term and 30th term of Arthematic progression are 121 and 181 respectively find the 40th term of Arthematic progression.

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Answer 1

Answer:

• a+20d=121
• a+29d=181

Now eliminates both above equation.

• -9d=- 60
• d=20/3

Now a+20d=121

a+20(20/3)=121

a+40/3=121

3a+40=363

3a=323

a=323/3

a=107.6

nOw a40

will get by

an= a+(n-1)d

Answer 2

Answer:

The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere. Wikipedia

Explanation:

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