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Updated on: 10 May 2020, 10:55
Originally posted by GMATBusters on 09 May 2020, 18:53.
Last edited by GMATBusters on 10 May 2020, 10:55, edited 3 times in total.
Last edited by GMATBusters on 10 May 2020, 10:55, edited 3 times in total.
Renamed the topic and edited the tags.
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E
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Difficulty:
25%
(medium)
Question Stats:
71% (01:05) correct
29%
(01:21)
wrong
based on 312
sessions
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Time
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GMATBusters’ Quant Quiz Question -3
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If m = 7^20 + 7^21 + 7^22, what is the largest prime factor of m?
A. 3
B. 7
C. 13
D. 17
E. 19
09 May 2020, 18:55
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Official Solution:
m = 7^20 + 7^21 + 7^22
= 7^20( 1+7+49)
= 7^20(57)
= 3*19*7^20
the largest prime factor = 19.
Hence Answer is E
09 May 2020, 19:05
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If m = 7^20 +7^21 +7^22, what is the largest prime factor of m?
m = 7^20 (1+7^1+7^2)
m= 7^20 (1+7+49)
m = 7^20 (57)
m = 7^20 (19*3)
A. 3
B. 7
C. 13
D. 17
E. 19
Ans. E
m = 7^20 (1+7^1+7^2)
m= 7^20 (1+7+49)
m = 7^20 (57)
m = 7^20 (19*3)
A. 3
B. 7
C. 13
D. 17
E. 19
Ans. E
