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प्रश्न
How many two digits numbers are divisible by 3?
उत्तर
Two digits numbers divisible by 3 are
12,15,18, .......99.
a = 12, d= 15 -12=3
implies that
Tn =99
implies that
a + (n -1) d = 99
implies that
12 +(n -1)3 =99
implies that
n = 30
numbers of two digit numbers divisible by 3 are 30.
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