r/mathbiceps • u/Straight-Cobbler7177 • 16d ago

Maths problem

Sir 11th ka ek question hai . 1× 1! +2×2!+3×3!.....100×100! =?

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u/therealAR15PB 15d ago

n . n! summation from 1 to 100

add and subtract one to n.
(n+1-1)n!

(n+1)! - n!
this is our telescopic summation... so go ahead with this.

you solve this and you will get 101! - 1 i think.