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Answer: Combination expressions can be solved using the following formula:
nCr = n!/[r! (n – r)!
Substituting four and two into the formula, n = 4 and r = 2, the result is,
4C2 = 4!/ [2! (4 – 2)!
= 4!/ (2! 2!)
= (4×3×2×1)/ (2×1×2×1)
= 6
Hence, the value of 4C2 is 6.
