Question

Which term of the AP 3,15, 27, 39, ... will be 120 more than its 21st term?​

Answer 1

Answer:

31

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

1.

the regions of the surface and atmosphere of the earth or another planet occupied by living organisms.

2.

an artificial structure enclosing a self-contained ecosystem or ecosystems.

"the elliptical domed biosphere is the largest single-span glasshouse in the world"...