CBSE Class 10 Answered
check whether 15^n is divisible by 7
Asked by Nimmi | 01 May, 2018, 03:07: PM
Expert Answer
Here, 15n = 15, 225,....... n = 1, 2, 3, ............
Neither 15 nor 225 is divisible by 7.
Therefore, 15n is not divisible by 7.
OR
Here 15n = ( 3 × 5 )n = 3n × 5n
Prime factor of 15 are 3 and 5 .
Neither 3 is divisible by 7 nor 5.
Therefore, 15n is not divisible by 7.
Answered by Yasmeen Khan | 02 May, 2018, 11:44: AM
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