Question

Find the reminder when 7^21+7^22+7^23+7^24 is divisible by 25

Answer 1

Answer:

Hey mate...

2.2341835e20/25=8.936734e18

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Answer 2

(7^21 + 7^22 + 7^23+ 7^25)/25

=7^21( 1 + 7 + 14 + 21 )/25

=7^21 ( 43) /25

=5.585458641*10^17*43/25

=2.401747216*10^19/25

= 9.606988862*10^17