GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 May 2019, 21:59

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 55231
7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

12 Dec 2015, 09:04
2
3
00:00

Difficulty:

15% (low)

Question Stats:

69% (00:32) correct 31% (00:53) wrong based on 203 sessions

### HideShow timer Statistics

$$7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =$$

A. $$7^b$$

B. $$7^{(b + 1)}$$

C. $$7^{(7b)}$$

D. $$8^b$$

E. $$49^b$$

_________________
Current Student
Joined: 25 Feb 2014
Posts: 221
GMAT 1: 720 Q50 V38
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

12 Dec 2015, 09:18
Easy one.

7*7^b = 7^(b+1)

Ans. B
_________________
Consider KUDOS if my post helped

I got the eye of the tiger, a fighter, dancing through the fire
'Cause I am a champion and you're gonna hear me roar
Intern
Joined: 29 Mar 2015
Posts: 8
Location: United States
GMAT 1: 650 Q39 V40
GPA: 3.6
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

26 Dec 2015, 04:20
I'm not able to make sense of this, can someone please explain the theory behind this?
Math Expert
Joined: 02 Aug 2009
Posts: 7684
7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

26 Dec 2015, 04:28
3
Htlol wrote:
I'm not able to make sense of this, can someone please explain the theory behind this?

Hi,
$$7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b = 7 * 7^b$$

now $$7 * 7 ^b =7^1*7^b=7^{(b+1)}$$as per the property of power..

B
_________________
Intern
Joined: 29 Mar 2015
Posts: 8
Location: United States
GMAT 1: 650 Q39 V40
GPA: 3.6
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

26 Dec 2015, 05:00
chetan2u wrote:
Htlol wrote:
I'm not able to make sense of this, can someone please explain the theory behind this?

Hi,
$$7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b = 7 * 7^b$$

now $$7 * 7 ^b =7^1*7^b=7^(b+1)$$as per the property of power..

Now it makes much more sense. Kudos!
Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2823
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

26 Oct 2017, 15:39
1
Bunuel wrote:
7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =

A. 7^b
B. 7^(b + 1)
C. 7^(7b)
D. 8^b
E. 49^B

Simplifying the equation, we have:

7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b

7^b(1 + 1 + 1 + 1 + 1 + 1 + 1)

7^b(7) = 7^(b + 1)

_________________

# Jeffrey Miller

Jeff@TargetTestPrep.com
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

VP
Joined: 09 Mar 2018
Posts: 1004
Location: India
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =  [#permalink]

### Show Tags

18 Oct 2018, 21:31
Given 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b

Just added the above to give us = 7*7^b

and since bases are same, we can add the exponents

Giving answer as B => 7^(b+1)
_________________
If you notice any discrepancy in my reasoning, please let me know. Lets improve together.

Quote which i can relate to.
Many of life's failures happen with people who do not realize how close they were to success when they gave up.
Re: 7^b + 7^b + 7^b + 7^b + 7^b + 7^b + 7^b =   [#permalink] 18 Oct 2018, 21:31
Display posts from previous: Sort by