Question

IS 83 is a toom or the
Ap 3,7,11
a+(n-1)d=84
3+(n-1)4=83
(n-1)4=83-3
(n-1)=80/4
(n-1)=20
n=20+1
n=21​

Answer 1

Answer:

Yes 21 is the perfect and right answer

Step-by-step explanation:

method

find the atoms number (परमाणु क्रमांक)

Given- 3,7,11

atom number:- 3+7+11 = 21

I hope it is useful for you