Will give brainliest for *correct* answer use mathematical induction to prove the statement is true for all positive integers n. 10 + 20 + 30 + + 10n = 5n(n + 1)

To prove something by induction you need to verify 2 things
1-the base case,2-it holds for n+1
the base case n=1
10=5(1)(1+1) which is true
it holds for n+1
10+20+30++10(n+1)=5(n+1)(n+2)
5n(n+1)+10(n+1)=5(n+1)(n+2)
(5n+10)(n+1)=5(n+1)(n+2)
5(n+2)(n+1)=5(n+1)(n+2) which is true our proof is done.

What’s your question.

Ithink it’s b because it say 3 plastic rings and all the balls