The sum of the value of the digit at the tens of all the number formed with the help of 3,4,5,6 taken all at time is

a)1080

b)4320

c)360

d)180

The tens of the numbers 3,4,5,6 are 30,40,50 and 60 respectively. Therefore, the sum of the tens will be :30+40+50+60=180.So,option(d) is the correct answer. 

Dear student

 

sum of digits in the ten’s place= 

 

(4-1)! (30+ 40 + 50+ 60)

 

= 1080

 

hope it helps

 

Regards

Arun (askIITians forum expert)