MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 11
        The unit digit of expression (1!)^99 + (2!)^98 + (3!)^97+ .........(99!)^1 is(A)1 (b)3 (c)7 (d)6
3 years ago

Answers : (1)

Sumit Kumar
30 Points
							
The unit digit of (1!)^99 is 1.The unit digit of (2!)^98 is 4.The unit digit of (3!)^97 is 6.The unit digit of (3!)^97 is 6.The unit digit of (4!)^96 is 0.Now since we know that all the factorial numbers starting with 5! has its unit digit 0.So we need not to calculate it.Thus the required unit digit= unit digit of the sum of the unit digits.Thus the unit digit is 7   (1+4+6+6+0=17). Hope you got your answer ☺😊
3 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies


Course Features

  • 731 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 101 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details