To find the no. of zeros find either

1) no. of 5's in the series( as 5*2 =10 makes the zero)

2) if a no. contains the zeros itself (like 30, 20 and 10 in above series)

In the above series we have enough two's, all even no(28,26,24....2) will provide us the two. We have to only look for the 5's and that will come from 5, 15,25.

in 5^5 gives 5 5's

in 15^5 gives 15 5's

in 25^5 gives 50 5's

therefore total- 70 5's i.e. 70 zeros.

also, if a no. contain a zero itself when multiply itself it will have the no. of zeros equals to( no. of zeros in the no. at the right end)* (power of that no).

30^30 will give 30 zeros.

20^20 will give 20 zeros

10^10 will give 10 zeros

Total- 60 zeros

Overall we have then 60+70= 130 zeros.

Also see the attachment for more detail

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