Question

If U= { 1,2,3,4,5,...,10} ,a = { 1,2,3,4,5} . A ∆ B = { 1,2,3,4} , then n(B -A) is​

Answer 1

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If U= { 1,2,3,4,5,...,10} ,a = { 1,2,3,4,5} . A ∆ B = { 1,2,3,4} , then n(B -A) is

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$\sf \red{Here,} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ A=(1 2 3 4 5) \\ B=(1 2 3 4) \: \: \\ \: \: \: \: \: \: \: \: \: \: U=(1 2 3 4 5 ... 10) \\ \sf\red{therefore,} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: n(A) = 5 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ n(B) = 4 \\ \: \: \: n(U) = 10 \\ B-A = 0 \\ So, n(B-A) = 0 \\ So, your \: answer \: is \: \red0$

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Answer 2

If U= { 1,2,3,4,5,...,10} ,a = { 1,2,3,4,5} . A ∆ B = { 1,2,3,4} , then n(B -A) is

Here,

A=(12345)

B=(1234)

U=(12345...10)

therefore,

n(A)=5

n(B)=4

n(U)=10

B−A=0

So,n(B−A)=0

So,your answer is 0