MEDIUM
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Write the first five multiples of 9.

Important Questions on Be My Multiple, I'll be Your Factor

EASY

The sum of all the factors of 156 is: 
(A) 392
(B) 235
(C) 390
(D) 379

MEDIUM

What is the number of Prime factor in 1518×410×69.

EASY

The total number of factors of 1156 is: 

(A) 9 

(B) 8 

(C) 10 

(D) 11 

EASY
If x is a prime number, LCM of x and its successive number would be:
HARD
The number of 6-digit numbers of the form ababab (in base 10) each of which is a product of exactly 6 distinct primes is
EASY
Which of the following is not a pair of prime numbers ?
EASY
The sum of the squares of the digits of the largest two-digit prime number is:
MEDIUM

Which of the following statement(s) is/are true?

I. There are 12 multiples of 9 from 7 to 109.

II. There are 9 multiples of 13 from 19 to 119.

HARD
Suppose a,b,c are positive integers such that 2a+4b+8c=328. Then a+2b+3cabc is equal to-
MEDIUM
For an integer n, let Sn=n+1,n+2,., n+18. Which of the following is true for all n10 ?
MEDIUM
How many positive factors of 24 are there?
EASY
How many numbers between 500 and 1000 are divisible by 13?
EASY

The prime factorisation of 240 is:

(A) 23×32×5 

(B) 24×32×5

(C) 24×3×5

(D) 25×3×5

 

EASY
How many positive factors of 68 are there?
EASY
There are four prime numbers written in ascending order. The product of the first three is 385 and that of the last three is 1001. The last number is :
EASY
A prime number p is called special if there exist primes p1, p2, p3, p4 such that p=p1+p2=p3-p4.
The number of special primes is
 
EASY
Which of the following number is an odd and prime number?
EASY
If a and b are positive integers such that a2-b2 is a prime number, then
EASY
How many two digit numbers are divisible by 9