1-4/7 what is the answer
Answers
Answered by
2
Step-by-step explanation:
Here,given
a=1
d=4−1=3
and,s
n
=287
Now,
s
n
=
2
n
(2a+(n−1)d)
⇒287=
2
n
(2×1+(n−1)3)
⇒287=
2
n
(2+3n−3)
⇒574=n(3n−1)
⇒574=3n
2
−n
⇒3n
2
−n−574=0
onsolvingthequadraticequatonusingformula
n=
2a
−b±
b
2
−4ac
Wegetn=14&
3
−41
[doesnotexist]
so,n=14
Now,
s
n
=
2
n
(a+1)
⇒287=
2
14
(1+x)
⇒574=14(1+x)
⇒(1+x)=
14
574
⇒1+x=41
⇒x=41−1
∴x=40
x=40isthesolution.
Answered by
1
Step-by-step explanation:
1 - 4/7 ,
= L.C.M = 7
= 1 - 4 whole / 7 .
= 7 - 4 whole/7
= 3/7 is right answer .
I hope it's helpful for all of you.
If yes, then please mark me as brainliest and click on the ❤️ for Thanksgiving to me .
Similar questions