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In an A. P 8,11,14,... Find …

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In an A. P 8,11,14,... Find Sn-Sn-1

Posted by Rp. Interiors 4 years, 5 months ago

CBSE > Class 11 > Mathematics

2 answers

Poshika Dhir 4 years, 5 months ago

In this AP a=8and d=11-8=3 Sn=n/2[2a+(n-1)d] =n/2[2x8+(n-1)3] =n/2 [16+(n-1)3] Replace n by n-1 Sn-1=n-1/2[2x8+(n-1-1)3] =n-1/2[16+(n-2)3] Now Sn-Sn-1=n/2[16+(n-1)3]-n-1/2[+(n-2)3] Now on solving you will get the answer hope it will help you thanks

1Thank You

Chiru Yavvari 4 years, 5 months ago

Vnnk

2Thank You

ANSWER

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CBSE > Class 11 > Mathematics