Question

Write a java programme to find the sum of series:

S=1/2-2/3+3/4-4/5.....-10/11

plzzzz try to answer fast if u know the full answer

it is urgent

class 10 icse board 2020-2021​

Answer 1

Input : n = 10

Output : 4290

1*2*3 + 2*3*4 + 3*4*5 + 4*5*6 + 5*6*7 + 6*7*8 +

7*8*9 + 8*9*10 + 9*10*11 + 10*11*12

= 6 + 24 + 60 + 120 + 210 + 336 + 504 +

720 + 990 + 1320

= 4290

Input : n = 7

Output : 1260