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If 3 2 = 7, 5 4 = 23, 7 6 = 47, 9 8 = 79 then 10 9 = ?

+3 votes
112,272 views

If

3   2 = 7
5   4 = 23
7   6 = 47
9   8 = 79

Then

10  9 = ??
posted Jun 27, 2015 by anonymous

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18 Answers

+6 votes
 
Best answer

(3*2)+(2-1)=7
(5*4)+(4-1)=23
(7*6)+(6-1)=47
|
|
(10*9)+(9-1)=98

answer Jul 22, 2015 by anonymous
its a multiple of 4 the entry calculation. What i did was as followed. 23-7=16, 47-23=24, 79-47=32, so the difference between each subtraction is 8 so that means 32+8=40 so 79+40=119, am i missing something? Can anyone elaborate?
That's the same logic I followed. So 119 is not correct??
if 2*3=3 5*4=6 2*8=7 then 3*5=?
What's this?
3*2+1=7
5*4+3=23
7*6+5=47
9*8+7=79
therefore
10*9+11=101 ya 10*9+9=99
            indrajeet g(add the odd number)
becouse this que. is odd even que. there becouse ans is 99
no sir, odd even nub is not  important .  if this question get like as 2  3 = 7
5  4  = 23 .............. and then 14  13 = ?  to aap kya karoge  to fir kitna time loge solve karne m....
+3 votes

Given series is,
ODD EVEN = RELATION
3 2 7 ( 3*2+1)
5 4 23 (5*4+3)
7 6 47 (7*6+5)
9 8 79 (9*8+7)
Following the series we concluded that, Next term in this series must be,
11 10 119 (11*10+9)

But for confusing, the question term is of different nature of,
10 9 ??

Hence the problem is from a complete series of the following type,

3 2 7 ( 3*2+1)
4 3 14 (4*3+2)
5 4 23 (5*4+3)
6 5 34 (6*5+4)
7 6 47 (7*6+5)
8 7 62 (8*7+6)
9 8 79 (9*8+7)
10 9 98 (10*9+8)
11 10 119 (11*10+9)

Hence the answer must be 98

answer Jul 27, 2015 by Md. Sadique Alam
98 is correct
+1 vote

(3*2)+1=7
(5*4)+3=23
(7*6)+5=47
(9*8)+7=79
(10*9)+9=99 or (10*9)+8=98........

answer Sep 29, 2015 by anonymous

3x2+1=7
5x4+3=23
7x6+5=47
9x8+7=79
10x9+9=99

10x9+"8"=98
+1 vote

I'm curious, why a*b+(b-1)= isn't the correct formula?
it gives correct answer for all given
3 2 = 7
5 4 = 23
7 6 = 47
9 8 = 79
and also does answer for any other numbers, like
5459 5458 = 29800679
and you should not to make calculations like
3+2+2=7
5+4+2+3+2+7=23
7+6+2+5+4+23=47
9+8+2+7+6+47=79
10+9+2+9+8+79=117
where you need to complete all middle steps to get the correct answer in further numbers

or if I'll remove a line from original example:
3 2 = 7
5 4 = 23
deleted line
9 8 = 79
so the "third" line of this example appears to be wrong if we need to sum 9*8 with 5 instead of 7 - 9*8+5=77
so it's can't be the correct answer.
but a*b+(b-1)= works same here.

maybe not all must be too complicated?
IMO

answer Feb 19, 2016 by Sergey Belov-Fishilevich (spon4ik)
+1 vote

3*2+1=7
5*4+3=23
7*6+5=47
9*8+7=79
10*9+9=99

answer Feb 19, 2016 by Aavishkar Kumar
–1 vote

3*2 +1 =7
5*4 +3 =23
7*6 +5=47

The and will be 98

answer Jun 28, 2015 by Sivaselvaraj
–1 vote

3+2+2=7
5+4+2+(3+2+7)=23
7+6+2+(5+4+23)=47
9+8+2+(7+6+47)=79
10+9+2+(9+8+79)=117

answer Jul 23, 2015 by anonymous 1 abuse reported
Its not the answer answer is 113
Prime numbers with 5 ,6,7,8 th positions gap inbetween
–1 vote

3 *2+1=7
5 *4+3= 23
7 *6+5 = 47
9*8+7 = 79

Hence,

10*9+8 =98

answer Sep 10, 2015 by Jyoti Mhaske 1 abuse reported
According to your solution it should be 10*9+9=99 & solution series should be simply 1 3 5 7 9.
Or we have a similar solution posted by Md Sadique Alam above, but I find it wrong as well, as the series is not starting by 1
–1 vote

ans=98
ie 10*9+8

answer Feb 21, 2016 by Gangadharan Kv 1 abuse reported

a*b+b-1=
10*9+9-1=98

–1 vote

3×2+1=7
5×4+3=23
7×6+5=47
9×8+7=79
10×9+9=99
Therefore ,99 can also be correct..........<:.....

answer Mar 9, 2016 by anonymous
since in question last digit is chanched from odd to even and vice versa.. so this pattern should be change in last vertical line also
so it become 8
then 10×9+8=98
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