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Calculus Level 2

An NCERT question -

How many terms are there in this sequence ?

− 1.8 , − 0.8 , . . . . . . . . , 20.2 -1.8 , -0.8 , ........ , 20.2

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The answer is 23.

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U Z by U Z , 24, Guyana

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4 solutions

Pranjal Jain
Feb 17, 2015

Since it seems to be an AP, add 2.8 to each term to get 1 , 2 , . . . 23 1,2,...23 . So 23 terms. :p

Nice title @megh choksi

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Girija Lenka
Feb 17, 2015

tn = a + (n-1) d =>20.2 = -1.8+(n-1)1 solving this we get n = 23

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Gagan Raj
Feb 17, 2015

A very simple Arithmetic Progression where the common difference is 1.

Keep adding 1 to each and every term you get starting from the first term term until you get the last term.

Count the number of terms you have got and that is your answer.

Enjoy and Learn!!!!!

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Rajath Naik
Feb 17, 2015

Its a simple AP problem..and its even simplified if one just puts first 5 numbers of the sequence and sees the obvious pattern..

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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