20 teachers selected sun rise beach. 12 teachers selected Mkapa bridge and St. Anthony's area. 16 teachers selected St. Anthony's area and Sun rise beach. 5 teachers selected all the three places. Each teacher selected at least two places. ( a) How many teachers selected Sun rise beach and Mkapa bridge (b) How many teachers were there?​

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(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

justin bieber ml.