find, How many two digit natural numbers are divisile by 7.
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The two digit natural numbers divisible by 7 are 14‚ 21‚ ..... ‚ 98.
Here‚ a=14 ‚ d=7 and n=?
We know that‚
tn= a+(n-1)d
98= 14+(n-1)7
98=14+7n-7
98=7n-7
98+7=7n
105=7n
n= 105/7
n= 15
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