Advertisements
Advertisements
प्रश्न
Explain why 3 × 5 × 7 + 7 is a composite number.
Advertisements
उत्तर
We have, 3 × 5 × 7 + 7 = 7[3 × 5 + 1],
Which is not a prime number because it has a factor 7,
i.e. it has more than two factors.
Hence, it is a composite number.
संबंधित प्रश्न
Express the number as a product of its prime factor:
140
There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Ravi takes 12 minutes for the same. Suppose they both start at the same point and at the same time, and go in the same direction. After how many minutes will they meet again at the starting point?
Determine the prime factorisation of the following positive integer:
58500
Write down the decimal expansions of the following rational numbers by writing their denominators in the form 2m × 5n, where m, n are non-negative integers.
\[\frac{129}{2^2 \times 5^7}\]
Write the sum of the exponents of prime factors in the prime factorization of 98.
Express the number as a product of its prime factor:
156
Express the number as a product of its prime factor:
7429
Find the H.C.F. of 252525 and 363636
Express 98 as a product of its primes.
When a number is divided by 7, its remainder is always ______.
For some integer q, every odd integer is of the form ______.
If the HCF of 65 and 117 is expressible in the form 65m – 117, then the value of m is ______.
The largest number which divides 70 and 125, leaving remainders 5 and 8, respectively, is ______.
Find the HCF and LCM of 72 and 120.
Find the HCF and LCM of 26, 65 and 117, using prime factorisation.
Assertion (A): The HCF of two numbers is 5 and their product is 150. Then their LCM is 40.
Reason(R): For any two positive integers a and b, HCF (a, b) × LCM (a, b) = a × b.
(HCF × LCM) for the numbers 30 and 70 is ______.
The prime factorisation of the number 2304 is ______.
The mean of first ten natural numbers is ______.
