Which of the following is not a prime factorization?

$30 = 3 \times 10$

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$15 = 3 \times 5$

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$120 = 2 \times 2 \times 2 \times 15$

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$18 = 2 \times 3 \times 3$

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Solution

The correct options are
A
$30 = 3 \times 10$

C
$120 = 2 \times 2 \times 2 \times 15$

Prime factorization is a method of expressing a number as a product of its primes.

30 as a product of its primes is 2 x 3 x 5

Therefore, $30 = 3 \times 10$ is not correct.

Similarly, 120 as a product of its primes is 2 x 2 x 2 x 3 x 5

Hence, $120 = 2 \times 2 \times 2 \times 15$ is also not correct.

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Question 21

Which of the following is not true?
(a) $3^{2} > 2^{3}$
(b) $4^{3} = 2^{6}$
(c) $3^{3} = 9$
(d) $2^{5} > 5^{2}$

f (x) = x^{3} + x^{2} f^{'} (1) + x f^{''} (2) + f^{'''} (3)

x ϵ R

x + y + z = 6, x + 2 y + 3 z = 10

x + 2 y + a z = b

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