Math, asked by shriyabhaskar02, 7 months ago

In an A.P if the 3rd term is 18, 7th term is 30 then the sum of first 20 terms is

Answers

Answered by prashanth200567

0

Step-by-step explanation:

18=a+2d ..... eq1

30=a+6d .....eq2

subtract eq1 from eq2

we get 12=4d

d=3

d value in eq 1 or 2

we get a=12

S=2a+(n-1)d=24+19.3=81

Previous Question

Next Question

Similar questions

Math, 3 months ago

x=4y write four solutions...

Chemistry, 3 months ago

1.8gm glucose dissolve in vessel in 1000 gm of water then what is the boiling point of solution if the value of kb is 5.12k kg /mole...

Business Studies, 3 months ago

what are the services that facilitate trade...

Social Sciences, 7 months ago

4) make a list of all......................made of stone ??? 5) Why do you think...................................... what they did???????

English, 7 months ago

which areas of the earth are generally populated?

Social Sciences, 11 months ago

Name the freedom fighter who "punished" Kesari to atttact Indian youth into freedom struggle...

Math, 11 months ago

what replacement for the unknown in each of the following will make the statement true log 3 81= L...

Math, 11 months ago

P,Q" and "R" can complete the whole work in "20" days."P],[" starts the wörk and works for ' "x'" days while "Q" and "R],[" completes the remaining "2/5" of the work in "14" days then "],[" find the value of "x"...