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Byju's Answer
Standard X
Mathematics
General Form of an AP
The first ter...
Question
The first term of an
A
.
P
.
is
5
, the common difference is
3
and the last term is
80
, find the number of terms.
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Solution
Given :
a
1
=
5
,
d
=
3
,
a
n
=
80
∴
a
n
=
a
1
+
(
n
−
1
)
d
80
=
5
+
(
n
−
1
)
×
3
75
=
(
n
−
1
)
×
3
n
−
1
=
75
3
n
−
1
=
25
+
1
n
=
26
Hence, This is answer.
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