Math, asked by leelavatisingh243, 10 months ago

Guys please answer fast

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Answered by nikmishra318

3

Answer:

2,5,7 do by yourself.

1.- 3,9,15...

An=17

S=1020

3.- A30=147,A20=97

A30-A20=50

6.- a+3d=0,a=-3d

25th term =a+24d=-3d+24d=21d

11th term=a+10d=-3d+10d=7d

hence proved.

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