PAG :
How many two digit numbers
which are
clivisible 3
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Answer:
12, 15, 18 ,-------- 99
a = 12
d = A-a = 15-12 = 3
an = l = 99
an = a +(n-1)d
99=12+(n-1)3
99-12 = (n-1)3
87÷3 = (n-1)
29 = (n-1)
29+1 = n
30 =n
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