Given the b= [1,2,3,4}, how many subsets have exactly two elements

6

{1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {3, 4}

6

Step-by-step explanation:

We are given that a set b={1,2,3,4}

We have to find number of subsets which contain exactly two elements.

Combination formula

We have n=4, r=2

Using the combination formula

=6

Subsets of given set which contain exactly two elements={1,2},{2,3},{3,4},{1,3},{1,4},{2,4}

Hence, 6 subsets of  a set which contain exactly two elements.

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation:

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