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UPSC NDA I 2010 Mathematics Paper
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© examsnet.com
Question : 22
Total: 120
The 59 th term of an AP is 449 and the 449 th term is 59 . Which term is equal to 0 (zero)?
501th term
502 nd term
508th term
509th term
Validate
Solution:
T
59
=
a
+
58
d
=
449
T
449
=
a
+
448
d
=
59
from
(
i
)
and
(
i
i
)
a
+
58
d
=
449
a
+
448
d
=
59
−
390
d
=
390
d
=
−
1
∴
a
=
449
+
58
=
507
⇒
a
+
(
n
−
1
)
d
=
0
(
n
−
1
)
d
=
−
507
,
n
=
508
© examsnet.com
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