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Step-by-step explanation:
1.140 = 2 × 2× 5× 7
2. 2 digit numbers divisible by 3
12,15,18,................................................99
a = 12 , d = 3
an = a + (n -1 ) d
99 = 12 + (n - 1 ) 3
99 - 12 = 3n - 3
87 = 3n - 3
n = 30
∴ number of two digit divisible by 3 are 30
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1st digit is 12
a2=15
d=a2-a
=15-12
=3
12,15,18...............................99
an=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
therefore two digit numbers divisible by 3 are 30
a2=15
d=a2-a
=15-12
=3
12,15,18...............................99
an=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
therefore two digit numbers divisible by 3 are 30
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