Question

1. In an AP, if a = 4, n = 7 and an = 4, then the value of 'd' is (1)
a 0
b. 1
C 3
d. 2
please say to me answer brother and sister. ​

Answer 1

an AP if a= 4 that means first term of the AP is 4.

n=7 i.e there are 7 terms in the AP.

an=4 i.e nth term of the A.P is 4

We know that an=a+(n-1)d

So 4=4+(7–1)d

=>4–4=6d

=>0=6d

=>d=0

Answer 2

Step-by-step explanation:

if thita and bitta are the roots of the equation 3x^2+x-10=0 then the value of 1/bitta + 1/thitta is ........a)10 , b) -1/10, c) 1/10, d) 1/3