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find the middle term of the AP 6 13 20 ................216

Posted by Vineet Jain 6 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Tanya Gupta 6 years, 11 months ago

a=6, d=7 an= a+(n-1)×d 216=6+(n-1)x7 216=6+7n-7 216=-1+7n 217 = 7n n= 217/7 n= 31 total no. of terms = 31 middle term=1/2 × (31+1) = 1/2 × 32 = 16th a16 = 6+(16-1)×7 = 6+15×7 = 6+105 111

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