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Class 10 Mathematics Arithmetic Progressions (AP)Finding the $n$th term of an APMedium

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In an AP, (a_1+a_2=18) and (d=4). What is (a_{10})?

Answer and explanation

Correct answer: (43)

(a_1+a_2=a+(a+4)=18), so (a=7). Now (a_{10}=7+9\times4=43). First find the first term, then the nth term.

Related tags

Ap First-Two-Terms Nth-Term Class10 Finding The $N$Th Term Of An Ap Finding The N Th Term Of An Ap Arithmetic Progressions (Ap)Arithmetic Progressions Ap

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