Binomial TheoremHard
Question
79 + 97 is divisible by :
Options
A.16
B.24
C.64
D.72
Solution
79 + 97 = (8 - 1)9 + (8 + 1)7 = 9C0(8)9 - 9C1(8)8 + 9C2(8)7 .....+ 9C8(8) - 9C9 + 7C0(8)7 +......+ 7C6(8) + 7C7
This is divisible by 64 & 16
This is divisible by 64 & 16
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