S5=30,S4=20, value of a5 is
Answers
Answered by
4
HEY MATE HERE’S YOUR ANSWER
HOPE SO IT WILL HELP YOU
HOPE SO IT WILL HELP YOU
Attachments:
anmolsidhu4:
Sry its wrong
d=2
From 1
10 a + 40 = 60
a= 2
A5 = 2+4(2)=10
Ans is 10
From 1
10 a + 40 = 60
a= 2
A5 = 2+4(2)=10
Ans is 10
Answered by
5
Answer:
Given,. S5=30
»n/2{2a+(n-1)d}=30
»5/2{2a+(5-1)d}=30
»2a+4d=60/5
»2a+4d=12...............(1)
Similarly,
S4=20
»5/2{2a+(4-1)d=20
»2a+3d=40/4
»2a+3d=8........................(2)
(1)-(2)»d=4
(1)»2a+4×4=12
»2a=12-16
»a=-4/2
=-2
a5=4a+d
=4×(-2)+4
=-8+4
=-4
Sorry,a5=a+4d=-2+4×4=-2+16=14
the options im given are 50 ,10,20,9
Similar questions