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Nidhi Ekka

· started a discussion

· 1 Months ago

i thin Q. is wrong (Question: 165110.0 )

7a5b642 probably i mean that '7*a*5*b*6*4*2'.

if m wrong, please send me the proper soluion.

thanyou

Question:
If 7a5b642 is divisible by 9, find the minimum value of (a + b).
Options:
A) 1
B) 2
C) 3
D) 5
E) None of these
Solution:
Ans: (c) According to divisibility rule of 9.

If 7a5b642 is divisible by 9

Then, (7 + a + 5 + b + 6 + 4 + 2) should be divisible by 9

Or (24 + a + b) should be divisible by 9

Therefore, minimum value of a + b = 3

Knowledge Expert

· commented

· 1 Months ago

According to divisibility rule of 9.
If 7a5b642 is divisible by 9

Then, (7 + a + 5 + b + 6 + 4 + 2) should be divisible by 9

Or (24 + a + b) should be divisible by 9

Therefore, minimum value of a + b = 3
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