akhil009
what is the unit digit of product.....
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akhil009
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|dw:1344435549985:dw|
telltoamit
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second digit is 25?
akhil009
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2nd component is 251
akhil009
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\[3547^{153}*251^{72}\]
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first digit: unit value changes like 7,9,3,1,7...
first digit: unit value remains 1
akhil009
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can you pls elaborate it
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7 into 7 = 49; 9 into 7 = 63; 3 into 7 = 21; 1 into 7 = 7
akhil009
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but ques is for 153 times also product of 251^72
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so after every 4 times it repeats. as 152 is a multiple of 4, the reptition will happen till there
on the 156rd multiplication , we ll get 7 again
so 7 into 1 = 7 == ANSWER
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gtg bye