use principle of M.I to show that 1÷1.2+1÷2.3+1÷3.4...+ 1÷(n+1)(n+2)=n+1÷n+2?

use principle of M.I to show that 1÷1.2+1÷2.3+1÷3.4...+ 1÷(n+1)(n+2)=n+1÷n+2?

Mth 101

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