CBSE Class 10 Answered
Plz help me .
Asked by | 29 Jun, 2008, 08:03: PM
Expert Answer
This Can be done by counting
for n =1,10n+1 = 11 ..............prime number
for n = 3,10n+1 = 31 ................prime number
for n = 4, 10n+1 = 41 ..............prime number
for n = 6, 10n+1 = 61 ................. "
for n = 7,10n+1 = 71 ................ "
so ther are five prime number as for n = 2,5,8,9 10n+1 will be equal to 21,51,81,91 respectively which are not prime numbers.
Answered by | 29 Jun, 2008, 09:21: PM
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