(4⁶¹+4⁶²+4⁶³+4⁶⁴) is divisible by ? then ?
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(4⁶¹+4⁶²+4⁶²+4⁶⁴)
4⁶¹ ( 1 + 4 + 4² + 4³ )
4⁶¹ × 85
4⁶⁰ × 4 × 85
4⁶⁰ × 20 × 17
• So , 20 is divisible by 10.
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(4⁶¹+4⁶²+4⁶³+4⁶⁴) is divisible by ? then ?
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