Question

If the sum of first three terms of AP is 27 then find first term​

Answer 1

Answer:

Sum of first three terms=27

a-d + a + a + d = 27

3a = 27

a=9

Sum of the squares= 29

(a-d) ^2 +(a) ^2 + (a+d)^2=29

a^2 +d^2 -2ad +a^2 +a^2 +d^2 +2ad =29

3a^2 + 2d^2 = 29

3×9×9. + 2d^2=29

243 +2d^2=29

2d^2= -214

d^2=-107

d= √-107

Answer 2

Step-by-step explanation:

let be the 3 no be x

(x+1)+(×+2)+(×+3)

3×+6=27

3×=27_6

3×=21

×=21/3

×=7 ans