Question

Prove by method of induction 1.3+2.5+3.7+....+n(2n+1)=n/6(n+1)(4n+5)

Answer 1

Answer:

6.5

Step-by-step explanation:

We let n=12

then 1.3+2.5+3.7+....+12(2*12+1)=12/6(12+1)(4*12+5)

7.5+.....+12*25=2*13*53

7.5+....+300=1378

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