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Byju's Answer
Standard VI
Mathematics
Prime Numbers
7× 11×13×15+1...
Question
7
×
11
×
13
×
15
+
15
is a prime number. Is it true? justify
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Solution
Given number
7
×
11
×
13
×
15
+
15
can also be written as
15
(
7
×
11
×
13
+
1
)
.
As it is a product of two composite numbers, hence it is not a prime number.
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0
Similar questions
Q.
(
7
×
11
×
13
+
13
)
is a composite number. Justify the statement.
Q.
(
−
15
7
÷
9
11
)
÷
3
13
=
−
15
7
÷
(
9
11
÷
3
13
)
If true then enter
1
and if false then enter
0
Q.
Find the sum of the following numbers without actually adding the numbers.
(i)
1
+
3
+
5
+
7
+
9
+
11
+
13
+
15
(ii)
1
+
3
+
5
+
7
(iii)
1
+
3
+
5
+
7
+
9
+
11
+
13
+
15
+
17
Q.
If
A
=
{
2
,
3
,
5
,
7
,
11
,
13
}
,
B
=
{
5
,
7
,
9
,
11
,
15
}
are the subsets of
U
=
{
2
,
3
,
5
,
7
,
9
,
11
,
13
,
15
}
, verify De Morgan's laws.
Q.
3, 5, 7, 9, 11, 13, 15.... is an
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