2
You visited us
2
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Mathematics
Sequence
Find the indi...
Question
Find the indicated terms in each of the following sequences whose
n
th terms are
a
n
=
5
n
−
4
;
a
12
and
a
15
Open in App
Solution
The
n
t
h
term of the sequence is
a
n
=
5
n
−
4
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
e
q
(
1
)
1) To find the twelfth term of sequence
(
a
12
)
put n=12 in eq(1)
⟹
a
12
=
5
×
12
−
4
⟹
a
12
=
60
−
4
⟹
a
12
=
56
2)To find the fifteenth term of sequence
(
a
15
)
put n=15 in eq(1)
⟹
a
15
=
5
×
15
−
4
⟹
a
15
=
75
−
4
⟹
a
15
=
71
Suggest Corrections
0
Similar questions
Q.
Find the indicated terms in each of the following sequences whose nth terms are:
(a) a
n
= 5n − 4; a
12
and a
15
(b)
a
n
=
3
n
-
2
4
n
+
5
;
a
7
a
n
d
a
8
(c) a
n
= n (n −1) (n − 2); a
5
and a
8
(d) a
n
= (n − 1) (2 − n) (3 + n); a
1
, a
2
, a
3
(e) a
n
= (−1)
n
n ; a
3
, a
5
, a
8