Question

What is the sum of 1,2,3,4and5 ?

Answer 1

Answer:

15 will be the correct answer

Step-by-step explanation:

1+2+3+4+5=15

Answer 2

Total number of 5 digit number including which begin with zero = 5! = 120 numbers of 5 digit number which begin with zero = 4! = 24

Sum of all five digit number = (0+1+2+3+4) ×4 ×(11111)

240×11111 = 2666640

Sum of all five digit number which begin with zero = (1+2+3+4) ×3! × (11111)

Hence the sum of the required number = sum of 4-5 digit numbers including those numbers which begin with zero = sum of all five number which begin with zero .

2666640 - 66660 = 2599980

Hope it help you please mark as brilliant.

Have a great day ☺️