Question

The first and the last terms of an AP are 17 and 350 respectively. If the common difference
is 9, how many terms are there and what is their sum

Answer 1

Given: First term = a = 17 Last term = l = 350 Common difference = d = 9 l = a + (n-1)d 350 = 17 + (n-1)9 n = 38 Again, Sn = n/2[a + l] = 38/2[17 + 350] = 6973 There are 38 terms in total HOPE IT MY BE HELPFUL

Answer 2

Answer:

No of terms (n) is 38.

Sum of terms=6973

Step-by-step explanation:

Tn=a+(n-1)d

350=17+9n-9

342=9n

n=38.

Sn=n/2(2a+(n-1)d)

Sn=38/2{34+(38-1)9}

Sn=6973

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