Math, asked by shriyabhaskar02, 9 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

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