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x is a consecutive whole number and the first four values of expression x3 + 3y -3 are 7, 20, 45, 88, then the fifth value is :
- a)137
- b)155
- c)158
- d)143
- e)None of the above
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
x is a consecutive whole number and the first four values of expressi...
Given expression x3+3y−3
Put the value of x=1
1+3y−3=7,
3y -2 = 7
3y = 9
y = 3
In Given expression Put the value of x=2
8+3y−3=20,
3y + 5 = 2
3y = 15
y=5
then
x = 1, y = 3
x = 2 , y = 5
same as x=5,y=11
The fifth value of expression is =53+3.11−3
= 125 + 33 -3
= 125 + 30
= 155
Hence, the correct option is (b).
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x is a consecutive whole number and the first four values of expression x3 + 3y -3 are 7, 20, 45, 88, then the fifth value is :a)137b)155c)158d)143e)None of the aboveCorrect answer is option 'B'. Can you explain this answer?
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