Answer:
120 4-digit numbers.
Step-by-step explanation:
For the numbers to be divisible by 5 they must end in 5.
So the total number of first 3 digits of the 4-digit number are given by the
number of permutations of 3 from the numbers 1,2,3,4,6 and 7 (6 digits)
= 6P3
= 6! / (6-3)!
= 6*5*4
= 120.
Each transversal crossing a line generates 2 pairs of vertical angles and for 3 transversal crossing the same line it will be 3 x2 = 6 pairs (or 12 angles)
40 adults and 140 kids
5
2
+
1
0
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