A child has 10 identically-shaped blocks - 4 red, 3 green, 2 yellow, and 1
blue. How many different stacks of all 10 blocks are possible?

the answer to the expression is 83

c

step-by-step explanation:

i think because what else can be a sample of every member

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)