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Find the 11th term from the …

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Find the 11th term from the last term (towards the first term)of AP :10,7,4...,-62...

Posted by Sukhveer Brar 7 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Deepika Choudhary 7 years, 1 month ago

First we have to find the number of terms Firt term(a)=10 Common difference(d)=(-3) An=a+(n-1)d -62=10 +(n-1)(-3) -62-10=3-3n -72-3=-3n 75=3n n=25 Now As we have to find the 11th term from the last therefore First term(a)=(-62) Common difference(d)=(3) Then A11=a+(n-1)d A11 = -62+ (25-1)(3) (n=25) A11= -62 + (24)(3) A11 = -62+72 A11=10

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Sukhveer Brar 7 years, 1 month ago

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CBSE > Class 10 > Mathematics