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Q1
:
(51+ 52 + 53 + ... + 100) = ?
A
2525
B
2975
C
3225
D
3775
Solution
ANS:
D
- 3775
This is an A.P. in which
a
= 51,
l
= 100 and
n
= 50.
Sum =
n
(
a
+
l
)
=
50
x (51 + 100) = (25 x 151) = 3775.
2
2
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