7- 11-13-15-15 is a prime number- Is it true- justify

Given number 7× 11× 13× 15+15 can also be written as #160; 15(7× 11× 13+1). As it is a product of two composite numbers, hence it is not a prime num ...

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Byju's Answer

Standard VI

Mathematics

Prime Numbers

7× 11×13×15+1...

Question

$7 \times 11 \times 13 \times 15 + 15$ is a prime number. Is it true? justify

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Solution

Given number $7 \times 11 \times 13 \times 15 + 15$ can also be written as $15 (7 \times 11 \times 13 + 1) .$

As it is a product of two composite numbers, hence it is not a prime number.

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Similar questions

(7 \times 11 \times 13 + 13)

is a composite number. Justify the statement.

(\begin{matrix} \frac{- 15}{7} \div \frac{9}{11} \end{matrix}) \div \frac{3}{13} = \frac{- 15}{7} \div (\begin{matrix} \frac{9}{11} \div \frac{3}{13} \end{matrix})

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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7×11×13×15+15 is a prime number. Is it true? justify

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.

$7 \times 11 \times 13 \times 15 + 15$ is a prime number. Is it true? justify

Given number $7 \times 11 \times 13 \times 15 + 15$ can also be written as $15 (7 \times 11 \times 13 + 1) .$

As it is a product of two composite numbers, hence it is not a prime number.