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Number Theory Level 2

Find the value of 5 ! + 6 ! 5! + 6! .

840 765 11 740

Apoorva Garg by apoorva garg , 19, India

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4 solutions

Sanyam Goel
Jul 10, 2016

5! + 6! = 5!(1+6)= 5!*7

and we know 5! = 120

so 120*7= 840 :-)

2 Helpful 0 Interesting 1 Brilliant 0 Confused
Hung Woei Neoh
Jul 18, 2016

5 ! + 6 ! = 120 + 720 = 840 5! + 6! = 120+720=\boxed{840}

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Apoorva Garg
Jul 9, 2016

5! + 6! (5 * 4 * 3 * 2 * 1)+(6 * 5 * 4 * 3 * 2 * 1) 120 +720 = 840

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Mohammad Khaza
Sep 17, 2018

how is that a level-2 math?!!

anyway,

5 ! + 6 ! = 120 + 720 = 840 5!+6!=120+720=840

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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