QUESTION

CSAT

Medium

Maths

Prelims 2018

While writing all the numbers from 700 to 1000, how many numbers occur in which the digit at hundred's place is greater than the digit at ten's place, and the digit at ten's place is greater than the digit at unit's place?

Select an option to attempt

Explanation

Hundreds digit = 7: Possible combinations for tens and units digits = 21 numbers. Hundreds digit = 8: Possible combinations for tens and units digits = 28 numbers. Hundreds digit = 9: Possible combinations for tens and units digits = 36 numbers. Total = 21+28+36=8521 + 28 + 36 = 85.

So, the answer is (c) 85.

Trusted by 2L aspirants

Practice UPSC Prelims PYQs Smarter

Practice Now
  • Track accuracy & weak areas
  • See past trends & repeated themes
Start Practicing Now

Year-wise Prelims PYQs

2025202420232022202120202019201820172016201520142013

Crack UPSC with your
Personal AI Mentor

An AI-powered ecosystem to learn, practice, and evaluate with discipline

Start Now

Download App

SuperKalam is your personal mentor for UPSC preparation, guiding you at every step of the exam journey.

Download the App

Get it on Google PlayDownload on the App Store
Follow us
COMPANY
About usHelp & SupportJoin UsPricing
STUDY RESOURCES
CONTACT US
Student Queries
ask@superkalam.com
General Queries
hello@superkalam.com
Chat onWhatsApp
+91 9319720944
ⓒ Snapstack Technologies Private Limited
Terms•Privacy Policy•Refund Policy