HARD
IOQM - PRMO and RMO
IMPORTANT
Earn 100

For any non-empty finite set A of real numbers, let sA be the sum of the elements in A. There are exactly 61 3-element subsets A of 1 ,, 23 with sA=36. The total number of 3 -element subsets of 1 ,, 23 with sA<36 is given by N. Then evaluate N+4525

50% studentsanswered this correctly

Important Questions on Number System

MEDIUM
IOQM - PRMO and RMO
IMPORTANT

Let the sum of the digits of the given product is written as A 8 B 6 C. Find A+B+C.

 1111111111112007 times×2007

EASY
IOQM - PRMO and RMO
IMPORTANT
When 2007 bars of soap are packed into N boxes of equal size, where N is an integer strictly between 200 and 300, there are extra 5 bars remaining. Find last two digit of N.
HARD
IOQM - PRMO and RMO
IMPORTANT

Let the number of distinct integers among the following numbers is N. Find the sum of all digits of N.

122007,222007,,200722007, where, · is the greatest integer function.

HARD
IOQM - PRMO and RMO
IMPORTANT
For each integer n4, let an denote the base-n number 0.133¯n. The product a4a5.a99 can be expressed as mn!, where m and n are positive integers and n is as small as possible. What is the value of sum of the digits of m?
MEDIUM
IOQM - PRMO and RMO
IMPORTANT

The square is a multiplicative magic square. That is, the product of the numbers in each row, column, and diagonal is the same. If all the entries are positive integers, what is the sum of the possible values of g?

 50  b  c
  d  e  f
  g  h  2

 

MEDIUM
IOQM - PRMO and RMO
IMPORTANT
How many four-digit numbers N have the property that the three-digit number obtained by removing the leftmost digit is one ninth of N ?
EASY
IOQM - PRMO and RMO
IMPORTANT
If a, b, and c are positive real numbers such that ab+c=152, bc+a=162, and ca+b=170, thenabc12 is
MEDIUM
IOQM - PRMO and RMO
IMPORTANT
If x, y, and z are positive numbers satisfying x+1y=4, y+1z=1 and z+1x=73, then find xyz?