Math, asked by dubeydivya560, 10 months ago

chapter :ap and gp
The first and the last term of an AP is 17 and 350 respectively. If the common difference
is 9 then, find the number of terms and what is their sum?

Answers

Answered by nirmalakagitha9

Step-by-step explanation:

a=17, d=9, l=350

l=a+(n-1)d

from this we get ,n=38=no. of terms

sum=s=n/2(a+l)=19(17+350) =6973

hope this is useful

Answered by Anonymous

Answer:

a = 17 , an = 350 , d = 9

an = a+(n - 1)d

350 = 17 + ( n - 1) 9

350 = 17 + 9n - 9

350 = 8 + 9n

350 - 8 = 9n

342 = 9n

n = 342/9

n = 38

Sn = n/2 {a + an }

S38 = 38/2 {17 + 350}

S38 = 19 {367}

S38 = 6973

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chapter :ap and gp The first and the last term of an AP is 17 and 350 respectively. If the common difference is 9 then, find the number of terms and what is their sum?