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In an AP the first term …

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In an AP the first term is 8. nth term is 33 and the sum to first n terms is 123 find 'n' and 'd'

Posted by Sudha Sudha 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 9 months ago

first term=a=8

nth term=l=33

Sum to first n terms = S_n = 123

S_n = [n(a + l)]2

123 = n(41)/2

n = 6

l = a + [n - 1]d

33 = 8 + 5d
d=5

2Thank You

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