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Byju's Answer
Standard V
Mathematics
BODMAS
Find the sum ...
Question
Find the sum of natural numbers from
1
to
140
which are divisible by
7
.
A
1470
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B
2344
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C
1234
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D
2334
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Solution
The correct option is
A
1470
1
to
140
7
(
1
)
+
7
(
2
)
+
7
(
3
)
.
.
.
.
.7
(
20
)
Sum of n natural numbers
=
n
(
n
+
1
)
2
=
7
(
1
+
2
+
3....20
)
=
7
×
20
×
21
2
=
7
×
10
×
21
=
1470
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Similar questions
Q.
Complete the following activity to find the sum of natural numbers from 1 to 140 which are divisible by 4.
Sum of numbers from 1 to 140, which are divisible by 4 =