Math, asked by IshitaJaiswal, 1 year ago

For an A. P., the First and the last term are 13 and 216 respectively. Common difference (d) is 7. How many terms are there in the A.P...?? Find sum of all the terms..

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Answers

Answered by ashokmadan57

Answer:

Step-by-step explanation:

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Answered by ashish5597

a=13 last term (T) =216
d=7
T=a+(n-1)d
216=13+(n-1)7
216-13=(n-1)7
203/7=n-1
29=n-1
n=30
Total no. of term = n+1=31
Sn=30/2*(26+29(7))
Sn=15(229)
Sn=3435

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