Book Maths Puzzle Numerical Ability Arithmetic

Proud that 0=1 (without use factorial)

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Book Other Question

Find the value of x
if,
A=4
B=14
C=x
D=76 How many 4 digit can be written using 1,2,3,4,5,6, and 8 only once such that 2 is contained once its answer is 4C1*7C3*3! how????