Question

Sum of series r! is

• A. (n + 1) !
• B. (n + 2)! – 1
• C. n (n + 1)!
• D. None of these

Answer 1

Answer: (C)

n (n + 1)!

Answer 2

T_r = (r² + 1 + r – r) r !

= r(r + 1)! –(r – 1) r !

T_r = r (r + 1)! – (r – 1) r!

S_n = n(n + 1)!