Please let me know the answer of this.
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2^30 * 3^20
=(2^3)^10 * (3^2)^10
=8^10 * 9^10
=(8*9)^10
=72^10
since 72 mod 7 = 2,
72^10 mod 7
=(2^10) mod 7
=1024 mod 7
= 2 (option b)
2nd ) U must remember divisibility rule of 7
If 70 is divisible by 7
K is left so
option (b) 7 is solution
Answered by
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a)4 is answer
b)7 is answer
b)7 is answer
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