how can I solve this.
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littyissacpe8b60:
I believe it is 10. 4^61(1+4^1 + 4^2 + 4^3) = 4^61 x 85 = 4^60 x 340 it can divide by 10
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= 4^61( 1 + 4^1 + 4^2 + 4^3 )
= 4^61 ( 1+4+16+64 )
= 4^61 ( 85)
Now simply .....
look at the options given to u....
Is 3 divisible by 85
or 10 ....11
we get that 10 is divisible by 85
so option (b) is correct
Hope this helps you.......✌^_^
= 4^61 ( 1+4+16+64 )
= 4^61 ( 85)
Now simply .....
look at the options given to u....
Is 3 divisible by 85
or 10 ....11
we get that 10 is divisible by 85
so option (b) is correct
Hope this helps you.......✌^_^
thanks a lot !
ur welcome
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