Math, asked by eswarchaitanya9359, 1 year ago

If the third term of an
a.P. Is 7 and its 7th term is 2 more than three times of its third term, then the sum of its first 20 terms is

Answers

Answered by tesla369189

4

Answer:

740

Step-by-step explanation:

a3= 7

a7=2+7×3=23

a7 = a+6d

a3=a+2d

a7-a3=4d

Gives d=4.

7=a+8

a= -1

a20= a+19d= -1+(19×4)=75.

S20=10(-1+75)=740.

Previous Question

Next Question

Similar questions

English, 6 months ago

attitude is a choice. happiness is a choice. optimism is a choice. kindness is a choice. giving is a choice. respect is a choice. whatever choice you make makes you. choose wisely explain it...

Science, 6 months ago

how does the process of fertilisation take place in Flower...

Science, 6 months ago

calculate the mass of the following ...

Economy, 1 year ago

Arrange the following events of China in chronological order and choose the correct alternative: i. Great Proletarian Cultural Revolution ii. Great Leap Forward campaign iii. Introduction of Economic Reforms iv. First five year plan Choose the correct alternative: a) ii, iv, iii, i b) iv, ii, i, iii c) ii, iv, i, iii d) iv, i, ii, iii...

History, 1 year ago

notes for the chapter nazism and the rise of Hitler...

English, 1 year ago

A BROKEN FRIENDSHIP - SAMUEL TAYLOR COLERIDGE Alas! They had been friends in youth; But whispering tongues can poison truth; And constancy lives in realms above; And life is thorny; and youth is vain; And to be worth with one we love, Doth work like madness in the brain. And thus is chanced, as I divine, With Roland and Sir Leoline. Each spake words of high disdain And insult to...

Social Sciences, 1 year ago

how were manuscripts written in indiabefore the age of print?what were there drawbacks and effects?

India Languages, 1 year ago

u have 4 pills 2 of fever and 2 of cold problem is that the size , weight , colour everything is same u have to take 1 of fever and 1 of cold how u will take....