Is 91 A Natural Number?

91 (ninety-one) is the natural number following 90 and preceding 92.

Find the average of the first 91 natural numbers.

Find the average of the first

The sum of all natural number 'n' such that 100 lt n lt 200 and H.C.F. (91, n) gt 1 is

The sum of all

The sum of all natural numbers ’ n ’ such that 100﹤n﹤200 and H.C.F. (91, n)﹥1 is: (a) 3203 (b) 3303…

The sum of all