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Other
Quantitative Aptitude
Progressions
Without addin...
Question
Without adding, find the sum of given numbers:
1
+
3
+
5
+
7
+
9
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Solution
This is an arithmetic progression whose first term is 1 and the common difference is 2 and number of terms = 5
Sum of an arithmetic progression =
n
2
×
(
2
a
+
(
n
−
1
)
d
)
Therefore, Sum =
5
2
×
(
2
×
1
+
(
5
−
1
)
×
2
)
Sum =
5
2
×
10
Sum =
25
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