Question

2.Ís 3 ! + 4-71?

Answer 1

The formula to calculate n! is defined as,

n!=1×2×3×⋯×( n−1 )×n

Substitute 3 for n in the above formula, to calculate the value of 3!.

3!=1×2×3 =6

Substitute 4 for n in the above formula, to calculate the value of 4!.

4!=1×2×3×4 =24

Substitute the value of 4! and 3!in 3!+4!.

3!+4!=6+24 =30

Substitute 7 for n in the above formula, to calculate the value of 7!.

7!=1×2×3×4×5×6×7 =5040

The values of 7! and 3!+4!comes out to be different.

Hence, 3!+4!≠7!.