Question 9 If the 3 rd and the 9 th terms of an A.P. are 4 and − 8 respectively. Which term of this A.P. is zero.
Class 10 - Math - Arithmetic Progressions Page 106
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Answered by
2
t3 = 4
a+2d=4
a=4-2d
t9 = -8
a+8d = -8
4-2d+8d = -8
6d=-12
d= -2
a=4-2(-2)
=4+4
=8
tn=0
a+(n-1)d=0
8+(n-1)(-2)=0
8-2n+2=0
10=2n
n=5
hence, 5th term of A.P is zero
a+2d=4
a=4-2d
t9 = -8
a+8d = -8
4-2d+8d = -8
6d=-12
d= -2
a=4-2(-2)
=4+4
=8
tn=0
a+(n-1)d=0
8+(n-1)(-2)=0
8-2n+2=0
10=2n
n=5
hence, 5th term of A.P is zero
Answered by
2
Answer:
t3 = 4
a+2d=4
a=4-2d
t9 = -8
a+8d = -8
4-2d+8d = -8
6d=-12
d= -2
a=4-2(-2)
=4+4
=8
tn=0
a+(n-1)d=0
8+(n-1)(-2)=0
8-2n+2=0
10=2n
n=5
so, 5th term of A.P is 0
Explanation:
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